Said this the other day, but I'll say it again. It really doesn't matter regarding Campbell, because Wenger quite obviously doesn't rate him. Campbell didn't play at the start of the season, really only got a chance to play when he was the only available player in the squad who had ever in his lifetime played right wing, and Campbell has hardly been seen since Walcott and Chambo came back from injury.
Having said that, I wouldn't be against him starting tomorrow at right wing. I think it would be foolish to have Welbeck starting 3 games in a week after having been out for so long, and I certainly want Welbeck to start at Spurs. Walcott should certainly not be anywhere near the starting XI the way I see it, so Joel is pretty much all we have left.