I mean, except UNC has never won a title in football, ever. And they've had exactly 1 season (1948) where they even finished in the AP top 5. As a program they've only had 8 10 win seasons or better as well.
Maybe eventually they could compete well enough, but the question is "will it be next year?" and Drake doesn't appear to think so. I feel like it's a move you only make if you want to play for a title in the CFP because I don't think another season at UNC with his sort of production is going to hurt his draft stock, if he goes to the SEC and gets exposed against better competition though he could hurt it.