Money's going to be what drives him out. Wallets aren't going to be opening anymore.To be honest, and not to hurt anybody's feelings, I think there's a non-zero chance he drops out tonight. 37 points is a pretty stiff loss for him to weather and still be confident that the later primaries are going to go enough better for him to get ahead.
But since Super Tuesday is literally in four days, I'd probably stay in if I were him, because yolo, so I don't really expect him to quit yet.