Fedor was an amazing fighter, but he has really not done alot to adjust his style, the evolution of the sport has moved past the fighters that choose not to evolve and rely on a limited skillset, now days you have to be well rounded.
Also some people hit a point in thier life where thier reaction time and awareness just up and fail them, Roy Jones Junior is a perfect example, he was one of the best fighters int he world, then one day he lost and he was never the same after, with every fight showing a slower reaction time to his opponents.
I appreciate his skills and he is a beast but his last 4 fights looked like he was a man only there to get his paychecks, I used to see an intensity in him when he fought in Pride, but as of late it has been subdued.
The guy has a lot of money and nothing further to prove, he still has a few good fights in him, but I honetly think it is time for him to take care of himslef and enjoy the rest of his life, he has been taking way to many heavy shots to the head of late.