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Once again, back in 1989 it was a single legal act by then (still) communist government of Poland that decriminalised (!) private trade that resolved all shortages and it happened literally overnight (same for travel).
There's *nothing* preventing Cuban government from saying "hey, from tomorrow you can open private firms, open a newspaper and get a passport for travel abroad".
If they're so "proud of their country" as you say, most of them will come back, won't they?