The Sannin are strong as hell but still the era madara lived in shinobi were on a totally different power level...I think the Sannin can defeat him, So Team 7 may have a chance.
And you think Madara wouldnt do anything to stop him? Just sit there and let it happen? I dont think soKakashi with Kyuubi cloak was about to wrap the whole freaking Juubi until Obito stopped him.Wrapping Madara and his Susano is childs play.