The main issue is: can Corbyn be an effective leader of the official opposition ?
He can't, because over 80% of Labour MPs oppose him.
Without discipline in the House of Commons, a party has little influence on the laws and decisions that affect the lives of the whole population.
Like it or not, the current Tory system is quite effective in letting both MPs and the members get their say and produce a leader they will mostly get behind, even in the current mess. So, it is possible to find a better method of electing an effective Labour leader
The Tories staggering incompetence and irresponsibility let their Bullingdon Bully leadership contest spread to dividing the country in two, probably sending the country into recession and splitting up the UK.
They have accidentally caused the most significant changes to the UK in the last 40 years at least.
The PM miscalculated. His friend stabbed him in the back and buggered off to Brexit, then got backstabbed himself
Any opposition leader who could find his arse with even one hand should be annhilating this useless shower, destroying them electorally, maybe ending them as a major party.
But we have the ridiculous situation that it's Labour who would probably lose if the new Tory PM calls an election.