It will depend if they get someone who thinks the problem is that they didn't go to the left enough or someone who'll return to a New Labour style centrist position. I think they need someone who doesn't appear to be a career politician who worked their way there though the standard Oxbridge PPE > Special advisor > Safe Seat MP > Party leader route. A centrist who can relate and 'cut though' to the disaffected working class demographics that they've lost to UKIP whilst appearing moderate and competent on the economy.
Easy. :P
---------- Post added at 09:24 ---------- Previous post was at 09:22 ----------
Dan Jarvis does seem good
http://en.wikipedia.org/wiki/Dan_Jarvis
Not associated with the old Labour people, was in the army, seems different to the usual slick Oxbridge types. Not sure of his politics though.