They only need to get their core support out if they really, really want to win, and I'm not sure they do. I think everything in the UK is so fucked that they might not want the aggravation of trying to put it right.
Obvs, none of the prominent MPs who've declared that they're standing down want any part in trying to sort out the mess they've made of things, but I'm not convinced any of them are really up for it. There's certainly no evidence of them doing anything positive to get things working properly.
There are a few of the complete nutters, like Fabricant and Anderson, might relish the prospect but they're the last people who should be trusted to do it, on account of them being two pence short of a shilling.
A good chunk of the sane Tories got chucked out because they didn't agree with Brexit and a good chunk of the remaining sane ones are stepping down. There's no-one in the parliamentary party now that could hold a candle to the likes of Grieve, Gauke and Greening, let alone a Hurd, a Heseltine or a Clarke.
There was a time when I respected many Tory MPs, despite being a lifelong Labour voter. I can't think of any that I really respect now.