I think if we fell out of the Top 4, van Persie and Rooney would leave right away... That would make it very difficult, as finding players of that quality to get our goals would be a tremendous task (we could still even lose both of those players this season/end of the season if rumours are true no matter our position).
I do think we'll finish in at least the Top 4 still, though. We still have the squad to compete on all fronts, but Moyes may be able to put together some January buys considering how much ground we need to make up for a title challenge. On current form, I'd say Man City will win it, but that could all change if they don't keep picking up results away from home. We need to sort everything out though!