John Harris writes in The Guardian:
For all his commendable policy positions Jeremy Corbyn has been a pretty awful leader. But in all its fundamentals, the state of his party is hardly his fault. To blame him is to fall for the same delusion whereby a supposed challenger – Angela Eagle, Tom Watson, Dan Jarvis – can put the party on the road to recovery. The truth, unpalatable to some but which is surely obvious, is that Labour is in the midst of a longstanding and possibly terminal malaise, and now finds itself facing two equally unviable options.