Indeed, its not even necessarily Labour's still rather 'on the fence' brexit policy, but Corbyn is providing something of a bulwark now to Labour comfortably beating Boris. Now i get a GE campaign would lead to a rise again as last time, and Corbyn would perhaps likely be able to win a GE (though marginally i suspect in best case)- as a GE Labour tends to run a decentralized campaign concentrating on local issues with a broader national message of change (To avoid brexit). However, Boris for all his policy and 'in office' incompetence is always a very good campaigner. Its one of the reasons i suspect that Boris himself might be the one to call an early GE before Labour can consider replacing Corbyn.
https://www.independent.co.uk/news/u...-a9024116.html
Something a stretch too far, but amusing to consider is that May's parting 'advice' to Corbyn was to step-down himself as well and know when he's 'had his time'. Many took this (probably rightfully) as a last parting shot, but there is something to it, especially as May detests Boris. Labour's polices are still popular, particularly when looking beyond brexit (which is there achilles heel) and into the kind of country Britain wants, Boris for all his promises has appointed a team who are already going towards a Thatcherite interpretation of reform, the exact neoliberal (ish) policies that have proven so unpopular, dropping working rights, putting the 'increases' not on state budgets, but primarily on councils who cannot afford it (i.e. they will not happen), Labours issue is now just Corbyn. I say this as someone who admires the man for his campaigning but also despairs at his and Labours persistent terrible control of 'main stream media' narrative and inability to spin, i get too that this is due to a very hostile reaction to him, but there is a fact that this hostile reaction has successfully limited what appeal he might have had, and he has (politically speaking) too many skeletons in the closest that could be and indeed were used against him to varying effects (his opponents also made the mistake though of over-playing a lot and thus lessening the impact, however that's understandable when the Conservative Government has essentially been in terminal decline since 2016 on the domestic front, when your record in office sucks, attack the opposition).
The question being then- will Corbyn go prior to the now snap-ge that nearly everyone agrees will happen? Or will he stay and if so- will he be able to campaign his way out of it? Bori's domestic position is weak, so Labour can score points there, but Boris unlike May (as well as the timing of thing) will make any GE prior to the 31st about Brexit, and i'm not sure Labour will be able to (as they did last time) shift the rhetoric to domestic policy simply because brexit is now so close.
The saving grace of course for Corbyn in those circumstances are that the brexit party will still 'be a thing' and thus Labour will likely scrape in- but note it wouldn't be due to Corbyn, it will be in spite of him.