I also expect them to fail. If they were responding to discontent among the members that would be different, but they're not. You seem to think it makes sense to support a group of people who;
Lost a democratic leadership election.
Decided to start an internal war in their Party at a time when they should have been uniting to attack a vulnerable government.
When their attempts to force their leader to resign failed, launched an official challenge.
Expect those who didn't vote for them a year ago to change their minds. Why? Because [they say] Corbyn isn't a good leader.
I expect the membership would like to test Corbyn's leadership skills with a supportive team rather than a group who were set against him from the beginning.
Perhaps Labour will rise from this stronger; appealing to it's true support base instead of trying to beat the Conservatives on their own ground. It would be nice for voters to have a clear choice instead of two similar parties.
If my boss was as useless as Jeremy Corbyn clearly is, then I would be looking for a new job. Unfortunately it's not that simple for Labour MPs. Their choices are
1) leaving politics altogether
2) joining a different political party one that does necessarily share their views
3) setting up a new political party of their own
4) speaking up about their issues with their boss, calling for a vote of no confidence in him and thereby forcing a leadership election.
5) Saying and doing nothing, whilst enduring poor his leadership and his insistence of repeatedly voting against labour policy, and hoping for the best.
Which would you do?
Democracy is all very well, I suppose you support the Turkish President too, seeing as how he was democratically elected and all, and despite the fact that he has all the makings of a radical Islamic despot. Hitler too was democratically elected I believe. (Yes Godwin's Law *clang*)