Blair and his ilk inflicted decades of damage on Labour. Corbyn hasn't had adequate time to rebuild, especially with ongoing corporate sabotage.
The scary thing is that people actually believe this.
The Labour party has moved on from Tony Blair, the country has moved on from Tony Blair. Get over f'cking Tony Blair, he isn't relevant any more.
The reason ex-Labour voters are now voting for the neoliberal, austerity, Brexit Tory party is not becuase of Tony Blair. It is because of Corbyn's ridiculous brand of dogmatic, anti-imperialist "leftism".
It is because Corbyn's utter incompetence and inability to lead his party.
It is because Corbyn has failed to sell any sort of message to the British people.
It is because Corbyn can't find anything to say about the issues that actually matter to people.
It is because he has at no point looked like a remotely credible leader.
But never mind, if he gets crushed, it will because of a man who stepped down 10 years ago; and we will see the Labour party dwindle into irrelevance, like the Liberals did in the 1930s.
With that, Corbyn will have single handedly destroyed any hope of a real left wing case ever being made and ever being given the chance to govern. Hisis incompetence is discrediting all left wing policies in the eyes of the British public; and making left wingers look incompetent, out of touch, irrelevant and clueless
This is Labour's major problem,
Lack of leadership and Credibility
and it been dragged down to local and nationwide elections.
Also image, a lot of people thought that a person with a history of being in the Left of labour and having that "image" would re-attract those labour voters who went to UKIP, SNP, and greens. Thing is that those scottish labour voters who voted labour only to keep the tories out pre-2015 are sticking with the SNP. Even if corbyn is more left-wing they dont have the competatance that SNP has after they have been governing scotland for a decade.
Plus some amount of middle class labour voters are deciding that their going to vote libdems and some even tory just because they dislike labour under corbyn.
Also those Labor->UKIP voters arent coming back unless labour changes it stance on immigration. Which corbyn is definitely not.