Thinking about possible developments in 2015 how likely is it that LEGO will be acquired by Disney? Quite possible. Look at the evidence.
Top LEGO licences:
Jake and the Neverland Pirates
And now Frozen
All owned by Disney.
What could block it?
The Warner Brothers licences, Batman, DC superheroes. The biggest threat to a Disney take over of LEGO might be the HOBBIT/Lord Of The Rings franchises. Tolkien famously stated he didn’t want Disney having anything to do with his Characters.
(Just some random thoughts of mine)