It's probably just the usual agent/player delays to get a new, bigger contract. Although this season there's been an unusual amount of rejections (very unusual) with Morrison, Pogba, some young defender, Nani & maybe more?
Even if he is inconsistent he is one of their better players so he is probably angling for a pay-rise to be somewhere near Rooney and the scum are kicking it back. Caving in to Rooney was probably one of the worst things they could have done (even if they didn't have much choice) and will cause all sorts of problems for their pay structure as all the players want a slice of the gravy train. Their wage bill went up 10% on their last accounts even without a load of bonus payments (Andersred blog Q3 accounts).
I still expect him to re-sign for them as I don't see any of the top clubs in Europe queuing for him although there may be a chance of PSG or an italian club going for him.
As for having him here, nope, even if they'd sell to us it would be a ridiculous price. On a free in a year's time, maybe, depends on what we do with our squad this summer but even then I'd expect us to be not interested enough to match what wages he'd want and he'd end up abroad somewhere.