Corporate consolidation concerns aside, the parks business would thrive from a major WB IP injection. They have a few timeless IPs (Scooby Doo, DC, Looney, Flintstones) that are begging for a major domestic presence at the parks, and HHN will have it somewhat easier to acquire IPs (at least one hurdle is gone).
I could be wrong, but from my reading of the MCA/Marvel contract, there is no stipulation regarding competing super hero/comic IPs elsewhere at the resort? Most of the contract ties Marvel use to the "SECOND GATE", and they had DC-related merch at USF for years.