Final leaders debate and what will happen post election

So the polls are in and suggest Cameron came out of the debate ahead.
But will the conservatives be able to get that overall majority? At best it will be a small one so my guess is this:

Even if Cameron does get an overall majority, the scale of the economic problem is so huge and the measures required so painful that they will want to share the responsibility. Therefore regardless of a majority it's my guess that the conservatives will make some sort of offer to the Libdems; not a full blown coalition, rather an economic war cabinet.