Sadly, they still have to play Rotherham and none of the other teams down there do. That three points should be enough to guarantee survival as I don't see each of Blackburn, Bristol City, Forest and Burton all getting to at least 49 points.
If Wigan were to put a miraculous run together and ensure that two, rather than one, relegation spots were in doubt, they might have a chance. I can't see it though.