West is going nowhere. The only question here is whether Arroyo will be part of the rotation or not, and take the PG responsibilities or not from West.
From what I've seen so far, a very good case Arroyo is making for himself to play 10 minutes or so.
As far as I see it, West will always be the first sub in in the 1/2 positions.
Now, if he he's sucking, then that's a different issue we'll face when it comes, but West has bounced back from injuries often enough that I'm not worried about his form in his return.
@ThePreacher, If you saw Pierce grimace is was probably after the 2nd shot in the 4th quarter when the ball rattled out. It wasn't a grimace of "man, this guy sucks shooting" but a grimace of "Man, that was in and it came out, and we needed that". And considering that everyone was missing open jumpers in that game, except surprisingly Rondo, then I don't think it's worth noting much.