The country is likely to liberalise some more. After the USSR broke up in the 1990s and was no longer able to supply Cuba with many essentials, Cuba was forced to ration many items and belts were drawn in by many notches.
Without Russia, Cuba has opened its borders to mass tourism, albeit in a controlled way (particularly for the workers on the resorts who are constantly reminded by large murals that they are working for the glory of Revolutionary Cuba and not to trust the lax morals of the tourists (or words to that effect; they're not supposed to be seen by tourists and my Spanish is crap at the best of times)).
It is likely that this will increase further when Castro dies; even the tour guides suggested this would happen - and it's an offence to criticise the government to tourists, we were told.
However, my impression is that most Cubans are proud of their country. They are proud of their socialised medical system, one of the best in the Carribean, they are proud of the high levels of university attendence and they absolutely do not want to give up their ideals. I think things will change, but possibly not as much as some might think.