Please note, the question isn't whether you think he will, but whether he should.
And do Labour stand a better chance (either of winning, or at least, not doing as badly) if he does, or doesn't?
In other words, regardless of whether you expect them to win or lose, are Labour better placed to either win, or lose by less, with him leading or without?
Personally, and while recognising that we can never take elections for granted, and that things can change in a hurry in politics (though a Falklands effect is a non-starter after Iraq and Afghanistan), I think Brown now has a level of unpopularity so great that they'd have better electoral chances with Kermit the Frog leading them ... which is why though I think they should change leader, I hope they don't. We need Labour out and somebody, just about anybody, else in. This next election, for me, has about the same level of appeal as being offered a binary choice between being shot in the head and burned alive at the stake .... I'd chose to be shot in the head, but wouldn't be awfully pleased about the range of choices I had.