Magic Kingdom is really no more IP heavy than any of the other parks.
Magic Kingdom is a series of loosely connected themes lands meant to represent some of the major archetypes of storytelling and imagination. Adventure, cowboys, the future, fantasy, the past, etc.
Epcot is half a celebration of the world and half a celebration of discovery and innovation.
Hollywood Studios has pretty much always been mostly IP as it is themed to the movies. Thus, it has a lot of lee way as far as what does and does not "fit"
Lastly, Animal Kingdom is nature, the environment, and animals. The icon of the parks has a 3d bugs life show in it. Literally built around IP.
Making a park "MK 2.0" in no way means making it more filled with IP. "MK 2.0" would just be making it themed to General ideas and archetypes. MK 2.0, if anything, would be Tokyo Disney Sea.
Areas themed to IP and IP only would be IOA 2.0. Especially if the new areas begin to feel devoid of personality and character of their own and just start to feel like touring movie sets.