I think he is a talented player who needs to be playing regularly in a team that will play to his strengths at this point in his progression as a player. He's been on a downwards slope of late, and being made a square peg for a round hole isn't doing him much good.
Previously, he has always looked better for Denmark than Arsenal (though he's been shit of late for Denmark as well). More direct, more willing to take players on and make something happen. He is not made for Arsenal's proclivity to want to backheel the ball into the net.
Apparently, Bayern are in for him and I reckon it would be a good fit. An easier league that should allow him some more confidence (natural, I mean. Not the inflated one he desperately clings to) to develop his game, but still at a high enough level that he can improve whilst surrounded by good players.
I do think he has the potential to be a top striker 3-4 years down the line, but he needs to get his next club right. He can't afford to be arsing about as a journeyman.