You have a lot more confidence in Congress than I do. They will moan and groan and kick dirt around then go along with what Obama wants.
I don’t think Congress will go along with Obama on this issue. Anti-communism and anti-Castro sentiment is still very strong in the GOP. It wouldn’t shock me if the establishment sees this as the opportunity to oppose Obama while supporting his other, more directly negative policies. Cuba could become smoke and mirrors for the GOP.