Hyde and Poyer comprise what is widely discussed and agreed upon in NFL circles as (still) one of the best safety combos on any team in the league. It is their efforts in making adjustments, assigning and disguising coverage pre-snap that give fits to coaches like Bill Belichick among others. I think physically Hyde is certainly dropping off a little, but he hasn't "hit the wall" and become a liability, and his intelligence makes him so valuable still on the field.