Yeah we'd be fine with 3 if we stick to this system. Problem is we may only be left with 1 (Rooney)... Falcao will be gone.. I'd personally let van Persie go along with him. It's the last window we could potentially get any sort of value on him.. His wages are very high and I don't think he's quick enough any more for the way we want to play. Hernandez is likely to be sold, although I'd actually prefer to keep him as an impact sub than keep the other two, at least he moves. Wilson could well be loaned out next season too.
Likely to be another very busy window really.
Another striker worth a mention is Ayoze Perez. Of the Premier League strikers linked I think he is the one who will have the brightest future. He just has it all - both feet, pace, good in the air, hold up play.. I think he'd benefit from another season or two at Newcastle but he looks like he will be a very good player down the line. The likes of Harry Kane, Ings etc have been getting the headlines but Perez looks like he'll be a far more complete player than any of them.