I think it's a bit silly to expect Disney to incorporate Blue Sky IP into the parks or even tout it as a relevant component of its animation portfolio. It's a second-rate studio turning out second-rate films, even if the Ice Age sequels performed steadily well overseas.
Legally, Disney can't even formally plan what they intend to do with Blue Sky... but the entertainment industry part of me knows they'll pluck out/poach relevant talent, perhaps farm some existing units to support Pixar or Disney Animation projects, salvage any useful assets and software, and then dissolve/disband/retire the brand.
In no realistic circumstance can I see an Ice Age or even a Rio attraction make it to the Disney parks.