It will be fascinating, in a morbid sort of way, to see what the Labour Party does to itself after the next humiliation at the ballot box. Even if Corbyn stands down the party is dominated by his supporters at local level, the surge in membership they had represents most of the people in the country who actually want him as PM, surely they would vote in someone similar in outlook (I know membership is plunging now, I'm guessing it is the moderates who are leaving in droves). Would the electorate be more supportive of a similar set of policies presented by someone with less baggage? I doubt it will have enough credibility.
You'd think that there would be a feeling of 'we have another five years of impotence, time to split and have two parties, hard and soft left, with distinct identities'. But I think that sentimental attachment to the name 'Labour' may prevent this from happening, many will prefer to immerse themselves in struggles for the 'soul' of the party, which will distract them from being a decent opposition even more. Perhaps a reverse takeover of the Lib Dems by the soft left would be more effective, though they tried that before with little lasting effect.
Perhaps politics have moved beyond left v right more towards nationalist (not in its most negative sense) v internationalist where both camps can include elements of both left and right.