There will be a flood of "I was there first" tourists that would go anywhere just to have the opportunity to say "Oh, you haven't been to XXXXX yet, I went last month and it was mahvalous dahlink!" Then there will be a few curiosity seekers, but as soon as Americans can't get their in-room coffee, they will be outtathere.
Personally, I really couldn't care less about visiting Cuba. There are just too many other worthier destinations.