I understand the doubts about Iwobi's position in the team but just look at the alternatives.
Giroud goes up top, Alexis goes back to the left. Back to last season's shape just with Mustafi in for Mertesacker and Xhaka rotating with Coquelin. Is that really much different to what we've seen for years now? Is it really going to improve us? Is it really worth trying again?
Perez is injured, Welbeck is injured.
And if we choose to keep Alexis at CF, who do we replace Iwobi with? Oxlade-Chamberlain is shit. Ozil is doing well behind the striker and there's little need to change his role. We no longer have Campbell or Gnabry. Who do we have left to play on the wing in Iwobi's place?
We have just that one other option and how long have people been sick and tired of it's failings already?
I think the key thing today was that we just didn't play well. If we played well, we simply wouldn't be calling time on Iwobi's position in the team.