Easy to make comments like this after a result like that, but...
I have been a bit uneasy lately with Arteta criticism, it seems a lot of the fanbase are either new or have very short memories. Where we're at these days is pretty amazing, and I just hope the lack of a PL title and various other minor disappointments don't get to the impatient types, or the new fans, and cause any fatal pile-ons of Arteta. I say give him 5 years from here before even considering any kind of major change.
This comment I saw in one of the letters to the editor on F365 sums things up pretty nicely in my opinion.
"3 years ago Arsenal weren’t even in Europe at all, we got jumped 5-0 and 4-0 by City and Liverpool and lost 13 league games, now they’ve turned over virtually the entire squad of players and are beating Real Madrid 3-0."