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Of course they are concerned about it. It's been the biggest complaint about the parks since making the evening news back in the mid-2000's. But addressing it by raising prices to throttle crowds after spending billions to "enhance" the experience without adding any substantial capacity is simply a mistake to correct a mistake.
I don't think that raising prices is considered a mistake. It's basic business to charge as much as the market will bear. Any business has to balance the number of customers that can be handled while pricing an appropriate amount to make a profit, taking into account a bunch of factors, including generational nostalgia and everything else.. Unless capacity can somehow be increased, you have to charge more if too many guests would otherwise be coming. Put another way, if you have too many customers, raise prices to get that number down. In the meantime, add capacity (which is usually a slow process). Also, shift those crowds to times that are currently less popular, if you can. Disney is doing all of that. FP+ evens out the crowds by letting guests choose the time of day when they want to be there (sort of).
MK now has a hub that can handle more guests for fireworks and projection shows, and they have new exit paths other than Main Street, and Fantasyland increased overall capacity as well. Epcot opens side paths on New Year's Eve, and just opened a 3rd screen for Soarin'. Capacity seems to be increasing in these and certain other ways, including big time with the impending Star Wars and Pixar at Studios and Avatar at AK. This will probably help relieve the overcrowded feeling in certain ways, and if they end up not being as popular, they'll lower prices and/or slap together some package deals to bring people in. In the meantime, the current price hikes may lower numbers a bit, but I assume that overall profitability is up, and is almost assuredly up on a per guest basis.
So, no, lowering attendance is not a mistake. It's basically an inevitable response to the too good job that WDW has done in attracting customers.