Cuba isn't going to be liberated just because Castro dies. Castro has his brother and other cronies to keep things in Cuba pretty much as they are after he passes.
Though I don't have any hard data to back it up, my gut feeling has always been that Cubans have been waiting for Castro to die before overthrowing the commies. It seems as if they have Stockholm Syndrome.
I have a feeling you're correct; meet the new boss...same as the old boss.