A tale as old as time. When the going gets tough, analysts always suggest a breakup.
Can you really imagine a separate Disney Parks company, content licensing company and ABC/ESPN/Cable network company? I can't.
There's safety in numbers. While the parks may be the star division right now, go back to 2002-2004. All it takes is one serious terrorist attack/threat/war/pandemic to tank the parks for years.
Additionally, the parks have always been a marketing arm for the studios/networks and vice versa.
There's plenty non-core enterprises to divest (A&E, Fox's cable networks, National Geo, etc.) first without breaking up the company. Then there's the multitude of spinoff ideas that are non-core like the Storyliving division that should have been cancelled months ago.
They need to get back to focusing on creating great products and stop outsourcing everything.