He's a promising young player who may, or may not, become a first team player. If he does, great, if he doesn't then we'll no doubt sell him on for a bit of profit.
He wasn't signed to make a massive difference to the first team, as Rashford was last January, but let's just wait and see. There's nothing wrong with the signing per se, it's just that people want big names who can improve the first team.