Hmm... It's a tough one. I don't think he has enough about him to be a United striker currently, a couple of nice goals years ago doesn't change that.
He never seems to deliver when he starts matches. His all-around game is erratic. I don't think he's particularly slow or weak, got decent pace and strength, but his movement leaves a lot to be desired.
He's a fine finisher in the box, but needs people putting those chances on a plate for him. And he, more than anything, needs a run of games. But, getting him those would mean loaning him out, and I'm not sure he'd thrive in a Premier League-side struggling for points, as the out and out striker. It's quite a dilemma this one.
I'd say he won't make it if pressed, right now.