Labour at the moment look unelectable. (https://twitter.com/YouGov/status/853920816169406464) But IF Corbyn recognises that Labour can't win with him in charge and steps down, whomever they pick instead is the beneficiary of a big honeymoon effect? Obviously the Tories counter that with "you know nothing about them!" but Labour re-counter with "you know about them, and you don't like it!" and turns it into a second referendum on Brexit and the NHS and wins.