It doesn't help that Winter, as it stands today, sounds very much unfit for release. There are some horrendous lyrics, musical gaffes (Viva La Vida strings at the beginning
), and the all-important hook is nowhere to be found. There are some pieces of honest-to-goodness enjoyable music in there though, and if they were to focus the song in on those, they may have something.
But if Winter is never released on an album, I don't think it's going to be the next Mercy. I, for one, wish it wasn't even released on Linear. Not with its currently muddled storyline and buttered toast.