It is all over for DM. He will take up a position in Ed's shadow cabinet, then quietly leave politics and probably the UK. I am quite sure of it. Beckysharper is right. He bottled it earlier on, and he does not want to turn Labour into the nasty party with constant infighting.
Also DH thinks that if EM fails, the electorate would see the same problems with David - too intellectual, etc.
Ed might pleasantly surprise us. His majority is not huge, so he might quietly adopt some of his brother's policies. And he said he would listen. We'll see.
I would not like to be DM when he wakes up this morning.