yeah a new manager wont change where we finish particularly, although it might give them room to assess the squad before the summer because there is no risk to make a change now. It could give them time to bed in. I don't think Arteta is right the job, like Lampard the lack of experience is really telling when chasing a game, tactics and substitutions. Lampard got the boot and Chelsea are winning again.
however, I think give him to about October/November time to see where we are at. If there is no noticeable improvement in results and league position then it would be time to go.