The polls are not promising, but then, polls can swing wildly and the memory of much of the public is like goldfish. On the plus side for Corbyn, he’s impressed a lot of people — even many who don’t support him — as being a good, principled man. He’s been again and again called a weak leader, but if he can ride out this revolt, he may come to be regarded as a strong leader. He will have weathered a far harsher storm than most politicians ever meet in their career.
And whether or not he makes it through, he is actually revitalising real interest in the Labour Party. He’s setting a new model for how politicians can and should act — with integrity — just as Bernie Sanders did in the US. Sanders may not be running for president now, but he’s changed the nature of political debate there, and forged a movement that will continue.
Corbyn may also become somewhat immune to criticism over time, as he has been subjected to so many complaints that proved groundless. People eventually start to ignore the cry “wolf!”.
Fundamentally, it’s not Corbyn’s leadership that’s at fault for the current poor polling— it’s this mutiny, which was calculated to destroy him, and the threat of a divided Labour party. If Labour can unite itself (which may well happen, following the leadership election), I think Corbyn may rapidly become an icon of leadership, and a symbol in many people’s minds for a real, viable political alternative.