i too would rather have kept the wotlk raid model, i thought it was fairly balanced and ive never quite understood blizzards claim that "people felt obligated to do both since there were 2 different lockouts" argument.
obviously my opinion and data is just from the small pool of my friends and those on my server but i never heard anyone complaining that they felt forced or absolutely had to do both lockouts. in fact it was the complete opposite for our guild. we always did 10 mans on friday or saturdays and the option of doing a 25 man pug was there for anyone lookin to grab extra pieces to help with the 10 man progression.
just my .02