Langston is in a good position to do it because of his look, his size, the fact that he's broken out on his own, and the fact that he's Cena's buddy. Depending on when they break The Shield up, *sniffle*, will determine when Reigns will win his first title whether it's 2014 or 2015. I think Ambrose is a stretch because when they do break The Shield up, *sniffle sniffle*, the only one of the three that's safe is Reigns, the other two are in danger of creative having nothing for them. Sandow's been pushed down the card and with Rhodes allegedly lined up to feud with Goldust, I don't see it happening for either of them, and even though Cesaro's over, he's still with Swagger and Colter and I don't see him holding the top strap while with the Real Americans.
It's a toss-up between Langston and Reigns, but I think Reigns is the safer bet.