According to The Hollywood Reporter, Disney’s reaction to the leaked news of a possible DreamWorks and Hasbro merger had a role in killing the deal:
Sources confirm that incensed Disney executives conveyed to Hasbro CEO Brian Goldner that they would deem the toy manufacturer a competitor should it acquire DWA, imperiling huge contracts involving Marvel, Star Wars and, per a very valuable agreement set to begin in 2017, princess merchandise from Frozen and other titles. Deals with Disney are estimated to generate nearly a third of Hasbro’s business. A source with knowledge of events says Disney execs had “a nuclear-level reaction” to the talks with DWA. Both Disney and Hasbro declined comment.