Not necessarily. There's still the paper fastpass system (of course this system will eat from the number of paper FP divided out).This is pretty much my thoughts as well. The only reason I'd be willing to pay is that I know I'd be screwed if I didn't.
I know probably no one cares about it here, but I do think it should be pointed out that you get photopass for the whole day with the $10 MaxPass. That will sell the pass on it's own as many people love photopass so being able to get as many pictures as you can in a day for just $10 along with reserved fastpasses is a big sell to your average tourist.