Absolutely you are going to either evolve or die.
My favorite evolution that you didn't put here was from bodybuilders and large muscles to the more lean frame and more cardiovascular endurance.
So you went from big huge meat heads like Kim(Ken) shamrock to really thin guys like Nate and Nick Diaz.
For sure, I remember the K-1 and Pride days when everyone was juiced to the gills. The match up between Izzy and Costa will be the perfect showdown between these two types of fighters.