The compensation offered by posters on this thread aren't even close. The Texans would want multiple picks from multiple drafts. Probably 6 - 10 picks over 2 to 3 drafts with most if not all of those picks in the top 3 rounds (3 1st round). He is a legit top 5 QB in this league.
The actual language of the contract is that Watson can be traded if he requests/approves it. Pretty much he can only be traded to the team of his choosing. Really smart thing to do now that we've all seen how freaking stupid Bill O'Brien is.