I would go further than that.
It will really be up to Arteta as to how much change he wants. I always believe that when a manger first comes in, that is when the carnage should happen.
Xhaka for example was meant to be our deep lying playmaker, and while he has performed well of late, he still does not dictate a game, nor does he protect the back, nor is he mobile.
Torreira, Guendouzi, and Xhaka should all be moved if possible.
Completely rebuild the midfield. Willock should be worked with, so we can see what we have.
A DM, DLP and a creative type should all be sought after, and if you can squeeze more, then do it.
Arteta has a massive rebuilding job, and it starts in midfield.