Cameron will hang around if only because he's their only hope of forming a government.  Afterwards, I don't think much of his chances.  The bottom line is they had a massive lead only 2 months ago and now they're scrambling to cobble a minority or coalition governing majority.  

While I admit total ignorance about the internals of the Lib/Dems it must be observed Clegg did them proud during the debate.  It's not his fault they couldn't seal the deal.  

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre