I think May will survive because nobody else truly wants the job, they would be on a hiding to nothing.
They wish to destabilise her from behind the barricades (so to speak), from a safe distance they can posture, throw abuse and promise the world without having to step up to the line. Nasty school kids in the playground.

Once any deal is done, then she will be ousted immediately and one of the big guns step into the breach to "clear up the mess he didn't cause".

I put Corbyn and Labour party in the same position, actual power right now would be a disaster for them, far better to shout the odds from a safe distance.

But I may be proven wrong very soon!