Sure Disney and Universal are competitors in the Orlando theme park industry, but the Walt Disney Company and NBC/Universal are not direct competitors in every sense of their respective companies. Money coming in from the Marvel/Universal contract is not going to be pumped back into WDW so Disney can compete more with Universal. More than likely that money is going to stay within the Marvel division.
I do agree Disney could make the arrangement as uncomfortable as legally possible to force Universal to drop Marvel. I just don't see a decision being passed down by the Universal execs to remove Marvel from IOA because Disney is a "competitor." Disney isn't going to try and get the Marvel rights back because Universal is a "competitor." Universal will drop Marvel when it is ready and Disney will add Marvel when they have something of substance to offer and all outstanding contracts are fulfilled.
I do agree Disney could make the arrangement as uncomfortable as legally possible to force Universal to drop Marvel. I just don't see a decision being passed down by the Universal execs to remove Marvel from IOA because Disney is a "competitor." Disney isn't going to try and get the Marvel rights back because Universal is a "competitor." Universal will drop Marvel when it is ready and Disney will add Marvel when they have something of substance to offer and all outstanding contracts are fulfilled.