This isn’t meant to be a discussion on the morality of the embargo, but the affects of the embargo ending for both countries. These affects can be political, economic, or social.
The US economy is so gigantic compared to Cuba’s that I don’t see it changing much at all for the US—maybe some medical advancements. For Cuba it would mean being able to acquire goods at more reasonable rates and probably a much bigger tourist trade if they’re not careful. Edit and better internet, I hear that’s important.