People were claiming all kinds of things about how we would decline under Wenger, plenty said we'd slip into mid-table. Last season was our worst finish under Wenger and even then we only missed out on 4th place by 2 points and we won the FA Cup.
The doom-mongers haven't exactly been vindicated, they said we'd be in mid-table years ago and that hasn't happened.
The club is, in theory, pretty well positioned for success right now. But Wenger is a spent force and we have a board who don't care so long as the money keeps rolling in.
Replacing Wenger would at least be different and right now that in itself would be a good thing, but with our board I don't see that as the silver bullet.