Maybe. But let's try and get him in as leader of Labour and then go from there. I think the public will like some of his policies and the fact that he is an honest, conviction politician.
Public ownership of railways - polls well with the public.
Public ownership of utilities - polls well.
Higher taxes for the wealthy - polls well.
Not wanting to go to war in Syria - polls well.
His views on immigration and the Royal Family don't poll so well. His stance on benefit cuts will probably win him friends as those who claim in-work benefits and voted Tory find themselves to be out of pocket over the next couple of years. There's a large pool of voters who don't vote, many of them young. His policies are pro young people and perhaps he can make gains from those who don't vote due to the "they are all the same" attitudes.
Apparently, the SNP put on a million more votes in the election just gone -- 500k from other parties (mainly Labour) and 500k from the 'don't vote' pool of voters. Scotland voted to remain part of the UK, but the Scots still went to the SNP for their anti-austerity policies. Things can change.
Also, whilst Corbyn's views on immigration won't play well with a lot of UKIP voters, the fact that he is willing to entertain leaving the EU might well do.
He's not a messiah, he's not got 100% perfect policies, but I agree with a lot of what he says and the positions he sets out. Galvanise the youth vote and who knows?
He's got to win the leadership first though