I can’t say that I am surprised.
Under Del Rio, the Jaguars were stuck on mediocrity. The Jaguars were 69-73 under Del Rio, with a 1-2 post-season record. The Jags have not made the playoffs since 2007, when they made it as a wild-card team. They have not won the AFC South during that time as well.
Del Rio did not help himself with dubious coaching decisions. First, while I understand that former starting QB David Garrard did not set the world on fire, he was at the very least a serviceable QB who did win some games for the Jaguars. As soon as Del Rio cut Garrard on the week before the season opener, I knew Del Rio would not be long for the job.
Del Rio was never a good in-game coach. His time management style was constantly under fire this season. He was also not the best at in-game adjustments.
Last but more importantly, the fan base (if there is one) soured on Del Rio. While fans became a bit lukewarm during former coach Tom Coughlin’s final years, at least at that time the Jaguars had a following in Jacksonville. Fans grew disenchanted with Del Rio, and management had to make a change to retain the few fans the Jaguars have.
I agree that Jacksonville had to make a change, but who in the world is going to coach this team and excite its fan base going forward?