We're not anywhere near that bursting bubble. Disney has been tightening budgets and raising prices aggressively for WDW with the purposeful intent of reducing the number of guests that show up during peak times. Just look at how day-ticket prices fluctuate by what days you plan to attend.
WDW, especially MK, has an overcrowding problem. They don't want more guests. They want the same or even less guests that pay even more per person. (What business doesn't want that?)
Iger himself on a quarterly call said that guest satisfaction goes down on very crowded days. That hurts the brand. That hurts long term attachment and repeat business. That hurts people's willingness to spend even more when they're at the park.
Until they can build up more capacity, especially at the three under-utilized parks and make them more attractive to pull people from MK, WDW will continue to raise prices. And they'll do so, because they can. They've been doing it for years and the numbers continue to grow. They'll keeping raising prices until they find that breaking point.
Disney can't run the parks at a price point that everyone can afford, otherwise, there would be 200 million people visiting every year, and MK would be as crowded every day of the year as they are during Christmas week... and they can't handle that. Short of a permanent reservation system, the only control on stopping overcrowding is raising prices. And it looks like we're still nowhere near that breaking point.