The sensible thing would be to wait until the summer - we get longer with Cabaye, gives us time to sort Cabella, Yo doesn't risk anything so close to the World Cup and maybe it'll push his fee even higher.
But I think Ashley will learn lessons from Tiote. When he was amazing, teams were meant to be interested for £20m. Then he turned terrible (even though he's almost back to that initial level). He won't want to risk Cabaye suddenly turning shite for no reason. Get PSG's money when he's at his peak!