I agree. Since the referendum, a lot of people on the Remain side has badly damaged its image with spite, insults, snobbery and sheer bloody arrogance. It's made it very hard to hear the sensible arguments being put forward over the clamour of 'RACISTS!', insults about the elderly, naked contempt for the working class and absurd talk about 'far right Tory government'. All that's achieved is to harden the resolve of Leavers to stick two fingers up.
Thon Clive Lewis fella is positioning himself quite nicely. An 'honourable' rebellion and resignation means he won't be seen as a traitor by the left, but away from the front bench he can generate support on the right and centre of the party. Timing, though, will be everything. I don't think another leadership challenge is feasible and the left will do anything to cling to power even if it means reanimating Corbyn's corpse, so yes I think the 2020 election is the only hope.