Are you a commercial contract lawyer with a few billion dollars to spend?
If not, that's you're uninformed opinion.
Granted, my initial statement is also my opinion, but I do deal with corporate legal agreements every day as part of my employment, and they are never as air-tight as people would like them to be. I've yet to find one that money and lawyers can't find a way around. And in my reading of the contract I see several ways Disney could leverage it in their favor, but it wouldn't be cheap and it would require arbitration/lawsuits. Which is why I said if Disney wanted to they could find a way to end run it. There's always outs or manipulations that can happen when it comes to legal agreements. It's just a matter of if they want to pay for them. A threat of legal action, and the cost that it entails is often enough motivation for a company to take a deal.
Comcast's war chest is 60% of Disney's. They couldn't keep up if it came to it.