Schneiderlin would be a top signing for us. From those quotes, I would think that he would be wary of choosing Chelsea; if he has his head on straight, then he will realize that Matic is the guy he will most likely compete with for a starting spot, and that is a tough act to better. He takes a look at us and sees that Coquelin is his competition though...
I'd keep Arteta even if we sign Schneiderlin or someone of similar or better quality. He is still a quality player, a model pro, and he seems to have earned the respect of his team mates. Qualities we certainly need.