Meh. Maybe I'm one of the few who's not that affected by this, probably because I never really felt an emotional connection to RvP.
Let him leave. He'll never have another season like last year again. Wenger is terrible at some things, but he's very good at making his star player look good. And he did that with the team consruction last season(particularly the first half).
This is more a psychological blow for the club rather than how it will affect our actual performance in the coming season. We lost Cesc(a much more influental player for Arsenal across many seasons) and Nasri last year and got 3rd.