Maybe this is faulty reasoning on my part, but if Disney increases the number of attractions that accept FastPass pretty dramatically, but maintains the existing FastPass distribution numbers or increases them only slightly, wouldn't that really only have the effect of spreading those FastPasses out over the entire park more?
Obviously more people will still seek a Soarin' FastPass than a SSE FastPass, but couldn't this (potentially) be good at evening out wait times across the board?
That is, of course, assuming that Disney isn't doing this to dramatically increase the number of FPs it can distribute in a day, which is probably the exact reason why it's doing this.