No one is taking up the torch yet but word is that a week is a long time in politics. Neither the EU nor Westminster haven't been in a position to reject the deal yet; if & when they do, do you keep a PM who has tied herself to a plan that no one clearly wants ? Or do you come to your senses at long last ?
Folk will likely throw their hat into the ring if & when the no confidence thing is triggered. Before then, not so likely. Most will probably hope someone else will volunteer, until they realise that they need to.