Man, your post don't have many reply , so i will try to stop your depression !!
Many of the guy that you are stating are still good fighters and i don't think they are no longer on there peak, it is more the level of the new and younger fighters who is increasing to fast !!
even if they reach a little bit higher peak or they keep there same level , i don't think that will be enough to beat the new generation of top fighters !!
overall, even if a couple of older fighter are still on top, the majority are decreasing slowly due to aging.
don't be sad , there are so many good news fighters to cheer for !!
Couture is not gone yet, and Matt Hughes neither, also, like you said , liddell and Wandy will colide even if it is not a champ vs champ fight it will be a good one !!
Crocop may never be the champ, but it doesn't mean that he will continue to lose over and over again, and Hendo is still a real top fighters and Silva will have to bring his A game to beat him !!