Labour is going through the same cathartic process that the Tories did, after their defeat in 1997.
But the big difference is that Labour won in 1997 with a massive majority, whereas dave only won last May with a wafer-thin majority. It took the Tories 13 years and 3 Leadership contests to come back and then only with the LibDems help.
Its likely that dave will have great difficulty in winning the upcoming vote on taking military action in Syria, and he faces the usual grisly war of attrition amongst his own Party, over any in/out vote on Europe. He has already been humiliated in the House of Lords, so its dave that has the bigger problem at the moment, not Corbyn and the Labour Party.
Perhaps dave will step down as Leader sooner rather than later ?
I don't dislike the man personally and if I were one of his close friends, I would be advising him to cut his losses now.