I'm not convinced he'll come back as Patriot, though. I figure they'd at least give him something to do if that was their goal. Even if he just expresses an interest in following Sam or doing something, but he's a pretty passive character so as to not overshadow Isaiah Bradley (who has the more sympathetic story).
I suppose it depends on how they tell the Young Avengers. If it's a Disney+ TV show where they can take time to build the team, there's plenty of time. But if they expect the characters to appear fully formed in a movie like the Avengers, we're a long ways away.