Yeah there's no way they are going to manage it.
I think Wimbledon are safe now and so they'll need to catch Wigan (and hope Northampton & Rochdale don't win!), which looks beyond any possibility.
Wigan's final games: Shrewsbury, Burton, Hull and Swindon
Gash's final games: MK Dons, Portsmouth, Crewe and Blackpool
Wigan will not be playing anybody that needs points, Hull will be up by then, Swindon will be down.
Whereas Portsmouth and Blackpool are both pushing for play off spots. The 15ers might get a shock win against one of them, but there's no way they'll beat both.