Also it doesn't matter what franchise you are all teams go through a period of losing at some point in time. Seattle has been a really good team since the start of the millennium making the postseason 12 times and going to 3 Super Bowls since 2000 but they also had a real bad period in the 1990's racking up 8 straight non winning seasons with QB like Rick Mirer and John Friesz.
Indianapolis and New England before Peyton Manning and Tom Brady weren't exactly world beaters.
Manning joined Indy in 1998 and that franchise is second in wins from then through the present day but from 1972-1997 a span of 25 years the Colts had only 8 winning seasons. The Colts were so bad in the 80's they were 2-14 in 1981 and were 1-15 in 1991 ten years later and went through 6 head coaches in that span. Brady has helped the Patriots win 5 Super Bowls since 2000 but they had some lean times in the past especially the beginning of the 90's going 1-15 in 1990 and 2-14 in 1992. The Colts were 1-15 in 1991 and 4-12 in 1993.
Who would've thought at the beginning of the 90's the two worst teams Patriots and Colts would both be the winningest franchises starting in the next decade when both were lucky enough to sign what many consider the two best QB's of all time.
Some of the strongest teams of the past two decades New England,Indy and Seattle were not that good in the 1990's meanwhile flip it the opposite way and some of the strongest teams of the 1990's like Buffalo who won 4 straight AFC Championships then has had trouble in the present day as they have missed the postseason 18 straight years.
San Francisco in the 1980's and 1990's won 5 Super Bowls and went to 10 NFC Championship games were the best team period during that era but since the turn of the millennium they have struggled mightily except for the short period Jim Harbaugh coached and are 9-35 in the last three years and went 2-14 in 2016 and could go 2-14 in 2017 as well.
All teams go through success and then have lean periods where they go through a rebuild.
Tennessee had 7 winning seasons,6 postseason berths,3 division titles,2 AFC Championship appearances and 1 Super Bowl Berth and notched 3 seperate 13 win seasons from 1999-2011 during that span no one had 3 13 win seasons except New England and Indy who had the two best QB's in the game in Manning and Brady.
However from 2012 through 2015 the team had 4 straight losing seasons they were in a tailspin due to having a bad GM who couldn't draft which was magnified by the drafting of QB Jake Locker who ended up being a big bust.
The worst was 2014 when they were 2-14 and 2015 when they were 3-13 and the last team to have league worst record back to back were......Indianapolis Colts who were 3-13 in 1997 and were 3-13 in 1998.
The two most important positions in a football franchise are the GM who is responsible for picking all the players and putting together an entire roster and the other is the QB who is responsible for running the offense and scoring points and is considered the leader on any team. So the GM and QB together determine if a team will succeed or fail.
Once Tennessee hit 2015 they got their QB in Marcus Mariota who was from Oregon and used to winning going 36-5 while playing there and then ownership brought in a GM Jon Robinson who spent ten years in New England and was 135-31 while there.
So Mariota and Robinson who were always used to winning would begin working together starting in 2016 and in their very first year together started winning guiding Tennessee to a winning year going 9-7 lifting the Titans out of their losing stretch. In year two the team is 8-4 with four games left.
It was impressive how GM Robinson started rebuilding the team.
Robinson started by bringing in RB Demarco Murray and drafting RB Derrick Henry. As for the offensive line they drafted offensive tackle Jack Conklin,signed center Ben Jones and guard Josh Kline to pair with two linemen already there left tackle Taylor Lewan and guard Quinton Spain for depth they had Brian Schwenke who plays multiple spots on the line in case of injuries.
That paid off immediately as the line played well and the run game did well.
At WR they signed Rishard Matthews which paid off in that area as well as he was the leading receiver. They also signed WR Eric Decker as well as drafting Taywan Taylor,Corey Davis and Tajae Sharpe who is on IR. At TE they already had Delanie Walker one of the best in the league as well as drafting Jonnu Smith.
In 2016 the Titans finished the season as the leagues number one red zone offense.
On defense the team needed cornerback help and drafted Adoree Jackson and LeShaun Sims the year prior in 2016 as well as signing Logan Ryan. They had great luck at safety drafting Kevin Byard in 2016 and this year leads the league in interceptions. They also signed Jonathan Cyprien a run stuffer and as depth they have vet DaNorris Searcy.
At linebacker vets Wesley Woodyard,Brian Orakpo,Derrick Morgan and Avery Williamson have all done well with Morgan and Orakpo getting double digit sacks. Rookie Jayon Brown has played well also.
On the defensive line DaQuan Jones was playing great but was injured and after four years may or may not return next season. Jurell Casey always plays well and the team signed Sly Williams this season as well as drafting Austin Johnson.
Roster wise only 17 out of 53 players remain from before Robinson's tenure meaning two thirds of the players joined while Robinson was GM.
Robinson has helped turn the team around as they have won six of their last seven games and also won ten of their last eleven at home. This year they have beaten Seattle,Baltimore,Jax and last year Green Bay,Detroit,Kansas City,Denver,Miami and Houston all were playoff teams.
Also Mariota leads the league this year with 4 game winning drives.
Robinson and Mariota have together rebuilt Tennessee into a winner working together since 2016
In two years they are 17-11 overall and should have Tennessee in the postseason at the end of 2017.