A deal this big would require Board approval, so they got nobody to blame but themselves if it happens.
As for funding, I believe Hasbro's market cap is around $8 billion, if my math is correct (it isn't always). Add a reasonable premium, and you're talking $11 billion or so for a purchase price. Disney's June 30 filing shows $4 billion in cash, a large portion of which, however, is needed to run current operations. However, the same filing also shows that Disney spent $2 billion in purchase of its own stock during the 9 months under June 30. Those are easily suspended if need be. In addition, the June 30 filing shows $12 billion in debt, while the Company's market cap is $90 billion. Plenty of borrowing capacity available without causing any real concerns about debt load. Translation -- a Hasbro purchase can be easily financed, even after taking into account the Lucas deal.