I think that you are trying to imply that Cuba could sell a lot more coffee and cane if they could sell to the U.S. I disagree. Cuba would likely see some small increase do to tourist sales, but not enough increase to affect their economy in any meaningful way.
As for your personal desire for Cuban products, if you really want them, you can get these things through Canada or other Caribbean islands(Bahamas, Cayman, Jamaica, DR). Probably Mexico as well, though I don't know this.
From personal experience cafe con leche is fantastic and can be made with many/any different types of beans. In my opinion Jamaican, Costa Rican, and Colombian coffee beans are all vastly superior in flavor to Cuban beans.
I'm unable to distinguish a taste difference in sugar canes, whether from the Caribbean nor the U.S. But, I'll grant that you may be able to discern a difference.