Demand only outstrips supply because there are lots of people who already own at least one property competing with those who just want a home to live in. Landlords, people with air bnbs, second home owners etc.
If people in those groups (not all but some) stop buying for whatever reason, and maybe even some landlords start selling (those with mortgages can't charge rent that covers all their costs, for example), and there are less people in a position to buy as they can't get the mortgage they need, I do think that changes the equation quite a bit.
I know a few people in the position of trying to buy who have mortgage fixes that are about to expire, and are pushing their sellers to complete, because they know they can't get the same mortgage again. I think for people in that sort of position, if their sale falls through, they'll hold off for a bit before looking to buy again.
I know it's different to 2008, and there will be less repossessions for various reasons, but a lot of people's mortgage payments are so high that 5% interest rates become as unaffordable as double digit rates in previous decades. In some cases, they may not let things get as bad as potential repossession- because suddenly renting will be significantly cheaper than owning. I'm talking about young people here, who maybe also need to move for work. And there will be people who literally can't pay, so what happens then?
I'm not saying a crash will happen, but those who maintain it's impossible because "demand outstrips supply" do need to consider there are circumstances where this no longer applies.
I actually think if things got to a 10% fall in house prices, people would start panicking, and you would see things in free fall. I think the government would want to step in to help- but would they be able to?