What they do have is sufficient supply of people who fancy the PM gig themselves- I assume we all agree that Mordaunt's ambitions haven't gone anywhere- and a big enough majority still to drag it out, even if they lose a byelection every few weeks.
There are a lot of people in the parliamentary Tory party, well into the 3 figures, who know they're out on their arses at the next election. They have every incentive to maximise their terms, and historically this is what people in that position do. It's been that way for decades now.
I'm not saying they'll necessarily go right up to 28th January 2025. But this has all the ingredients of a situation where turkeys get to delay voting for Christmas.