It depends on how you see brexit affecting any election. The Lib Dem’s are likely to put various conservative seats under pressure. In the last election until the fair reporting restrictions came in labour made little progress, at which point in a few weeks they turned a 25 point lead into a hung parliament. If brexit does not happen by the end of this month the true Brexit party / Conservative party position will be revealed, neither is likely to want to split the vote losing numerous seats.I must say I have to admire how much your defence of Corbyn is liked, given it does nothing but skirting the issues.
You have completely ignored the corroborating evidence given by Chessum and Lansman I referred to regarding Peston’s description of the Labour Conference.
No of course Johnson being appalling is not a natural bar to his electoral success, not if the Leader/Party of opposition is considered even more appalling by more – isn’t that exactly what the polls and graph above say?
Electoral landscape no longer swings between majorities for the two biggest parties? Sure, but why is that the case? Would LibDem be revived if Corbyn had given strong support to Remain, and cursed the Tory Brexit for what it is at every opportunity? I doubt it - a million reasons exist to split Leavers, but there is only one form of Remain, yet, Corbyn’s fence sitting has succeeded in splitting Remainers, driving supporters to LibDem.
You say it would be irresponsible of Corbyn if he didn’t want a GE before a PV? Given his/Labour’s dreadful unpopularity and FPTP, why is doing so not even more irresponsible, given it is far more likely for Con/BXP to win a majority at a GE than Leave prevailing in a PV, resulting in Brexit without a PV?