Utter nonsense.
The Castro, and now the post-Castro regimes have absolutely zero = ZERO intent to change their government whatsoever. PERIOD.
And why would you think want they want matters a damn? Oh right, it doesn't. Had trade been left open, Castro would have had fuck-all for control, and Cuba would have been the discount Miami three decades ago.
If you want to have regime change you don't starve a place, you feed it capitalism and liberalism. It works like a charm. People love freedom and cool shit.
In essence, the only reason Castro lasted as long as he did is because we made him into a worldwide martyr for all who hate America. That was a fucking stupid plan, that Obama has now dumped, decades after it should have been.
As for me, I'm planning to vacation there. I love the cigars when I can get them and I've always wanted to see the place. VISA cards for Cuban freedom. Just watch...