RaiderMatt, I think your questions are interesting ones. My family will come to WDW no matter WHAT the bad bosses do, but if they keep hours short we certainly may visit the parks less often. When we visited this Spring, AK closed by 5 and we saw virtually nothing. By the time we got over there, many of the shows were done and we couldn't believe the place actually closed so early. I wouldn't waste a ticket again on AK if it wasn't open later. We would spend the day swimming or shopping or just hanging out.
I spoke to a Mom here at home who mentioned their Spring trip to WDW. She was not impressed. They were mostly focused on doing the parks and stayed off-site, but she said the crowds were stressful and they got to ride too few things during the operating hours to justify the ticket price. Their family was much more impressed with SeaWorld, which offered a return visit for free or reduced price.
I think over the long term, limited hours and services DO affect park attendance, in different ways. My DVC family may spend less days in the parks, and other families may just not come at all. I hope some of the "powers that be" realize this!