I look at RJ's progression, well-documented work ethic, and intangibles and I'm thinking he'll continue to grow. When I think about the parts of his game that can improve, I think there's plenty of room to grow into an elite ball player. He's 21 years old averaging 20, 6, and 3 on 41% from the field and 35% from three on the year. That's against good defenses, bad defenses, and everything in between.
His three-point shooting and free shooting are very likely to continue to progress. He's got a ton of room to improve at the rim and he's still learning the reads as he slashes. I suspect that he'll also look to work on the pull-up from midrange or add a floater this offseason because Drew Hanlen is always plotting out how to add to RJ's bag with offseason workouts. None of this stuff requires more wiggle or any major changes to his game.
That's not to mention how the team around him could change to positively effect his play. He's spent this entire season without a consistent playmaking lead ball handler. He plays most of his minutes with Burks at PG and Fournier at SG. Randle's his top option to create easy looks. Now add in that his game improves with pace and that the Knicks have the second-worst pace in the entire league.
I'm not saying he's a sure star, but there are a lot of ways that RJ Barrett can live up to a big contract...especially after the next tv deal and CBA which a lot of heads are expecting to cause another significant increase in what the players are making just in general.
If you can trade him for a bonafide superstar, it's gotta be on the table, but even that comes down to which superstar it is and what else the other team is asking for.