i actually think he'd be quite a sage buy. we're losing berbatov and probably owen as well, and that leaves us with roo + chicharito + welbeck as the only options up front. i don't think kiko's impressed enough to come back strongly, so another true goalscorer, especially one who can do a job in a variety of positions, would be a welcome addition.
god forbid rooney gets a knock or worse, who can do that job? having a player who can (on his best day) approximate what rooney delivers wouldn't be such a bad problem, and i think his age actually benefits us as he's done the week-in, week-out bit and is now probably mostly interested in snatching a medal or two before calling time on his career.