Cain isn't going to win the nomination. If it came down to a battle between Cain and Romney, I think too many people might really like Cain but would think winning the nomination (and especially the General) would be too unrealistic. They'd end up going with Romney.
admittedly, I haven't watched the debates, so I don't really know how Cain is performing under the lights....but, if Cain (who at least has a plan) out debates Romney (who is halfway slick but never really says anything), I think Cain would trounce Romney.
Romney's only path to the nomination is by default: 1) every conservative GOP candidate disqualifies him/herself (which all have, with the current exception of Cain), 2) no one else enters the race...
This is spot on! Except I would say that Newt hasn't disqualified himself yet!