Well sure, we can all waft about intangible things like food standards we couldn't name if our life depended on it. Much easier to do that than actually challenge the fear of the foreigner. The very fact that Corbyn is still prattling on about a general election shows how out of touch he is.
It's a two horse race, so lets speculate. Say he wins, what would happen then? He says he'd be able to negotiate a better deal, but that has no more basis than David Davis' easiest deal in history waffle. The fundamentals wouldn't have changed one bit, and in many instances the UK would be in an even weaker position than two years ago as we've been fundamentally shown up in that time. He also wouldn't be able to present any more of a united front than the Tories have as half his party disagree with him. Even if he were able to do something though, why would the EU agree to grant an extension of another couple of years to renegotiate? They'd be well within their rights to roll their eyes and tell us to get our bloody act in gear.
Alternatively, there still remains a possibility that the Tories would win, in which case in Corbyn's eyes, they would have a mandate for something that parliament thinks is a rubbish idea, as do most of the public.
If I was a betting man, I reckon if you gave people a binding vote for 'none of the above' that would win in a landslide in any general election called right now.