After this Sunday, Alberto or Swagger will be #1 contender, and face Ziggler on a Raw or Smackdown sometime soon. Once that happens, who will be Ziggler's next contender, realisticaly. Not someone like D-bry or Kane, because they'll feud with Shield for a little while longer after Extreme Rules, but someone who you could realisticaly see with nothing to do, and could easily be feuding with Ziggler.
I would say the only people I could think of were Show, Randy, Henry, or Sheamus, and possibly Christian if he returns, mainly because he has no direction yet, and could easily challenge Ziggler the night or week after he comes back.
Who do you think is a challenger?