I would agree with this more (and I see it posted here often, so please don't think I'm picking on you
) but I think that since so many people are vacationing in WDW on any given day, there are always enough people who want an ADR that have never been somewhere before. So if Ohana is filled with newbies one night, the rest of us who have seen things gone more "downhill" don't really get to "speak with our dollars" since Disney is still getting their bottom line.
I do agree with you to a point, though - people do re-visit places in the hope it will be something better than it is or was last time.