I doubt it will have much impact on park attendance.
On the other hand, it will be interesting to see how much farther Disney can push the "anti-Deluxing" of the Deluxe resorts and still fill them at the rates they currently command. Those who have stayed in a truly first-class hotel know that Disney's Deluxes do not compare. And, the "attractions corridor" has several properties that fit that definition of "first class" (the Ritz, the JW Marriott, and maybe one or two more), with a new one recently opened (the Waldorf) and another that, presumably, will be in development shortly (the Four Seasons).
Now, think about the mix of guests that likely make up the Deluxe roster: hard core Disneyana fans, and families of means who are taking their young kids for one of what will be at most a handful of the total trips to WDW they will ever take. The first category can be pushed pretty far; when the rubber meets the road, and they really have to decide where they are going to stay for their next trip, they are going to be staying on property somewhere, and probably still in one of those Deluxe resorts.
But, the second group---my sense is that second group is very much in play. Anecdotally, it seems to me that that second group looks at Disney's offerings, and increasingly finds them lacking. Things like cutting monorail service do not help Disney retain the second group of folks. For that group, location and convenience is the only saving grace for these resorts, because it certainly is not the quality of the rooms or the level of service, both of which compare to a good business class hotel but fall far short of the typical Ritz/Four Seasons/etc, despite charging comparable (or higher) rates.
"Group Two" guests are not taking ME. I guarantee it.