If you are suggesting that (in general) Disney is not investing in the parks, okay fine.
But if you are suggesting that the only reason that we won't see Marvel at WDW is because Disney won't "risk" spending money on a property that might be contractually questionable, well that is IMHO silly. Obviously, before Disney spends tons of money on development and building any attraction, they would have the legal folks be certain that it is free and clear to use. Heck, they at this point certainly have made that determination with BH6 and GotG considering they have used them in the parks.
The idea that they won't invest money due to uncertainty doesn't make any sense. There's a contract, there's lawyers, and if there's any questions, it's not like they can't have discussions and even formal written clarifications with Comcast.
We probably won't see much if any Marvel at WDW simply because Disney isn't investing money in general and Pixar and Star Wars seem to be higher priorities for use. But with the alleged Marvel plans at DLR, if anything is developed that is allowed at WDW (e.g. GotG), I would not be surprised at all to see it come to WDW in some capacity in the future.