Disney wants you to stay at their hotels, not the Marriott down the road. So the solution to nearly full booked WDW hotels during peak times is to build more rooms. It's just shifting where a person is staying, not necessarily adding more people to the resort
Odd, that seems to be the exact opposite of what people who have been there are saying, and that includes people I know first hand. The attendance issues has nothing to do with the land itself, it has everything to do with how TDA over analyzed their crowd concerns and over managed crowd control.