Only most of the upcoming contests are caucuses, where only Paul and Mitt are organized to compete. Gingrich winning SC, along with Iowa not being a Romney win, throws the race into unclear waters, with no one with a "unstoppable" aura around them. On balance, it's a better scenario for Paul.
Id much rather see Santorum doing well than Gingrich doing well. And the original plan of bringing it to a 2 man race I liked.
But if we believe polls, most polls do not show good head to heads Paul vs Romney. I've seen really bad ones. 65-35 for Romney vs Paul is not good. Of course, we couldn't know that that's what the polls would be seeing now before Iowa.
Gingrich can win, Santorum cannot.