Would Cameron resign if defeated in 2015 ?

I ask as one possible expatiation for the Give demotion is to have a tight grip on the troops to survive a defeat.

After all Cameron has left it be understood he won't go if Scotland leaves the union. Why should a general election defeat stop his career ?

Another possible view is that Give and Hague are now available as super subs if the LibDems decide to leave the coalition.

Any other ideas of what's going on ?