I have no doubt that the novelty of a foldable iPhone will prove your statement correct. Plenty of people are going to want to try it.
But between initial release and over the course of a few years, you're going to have people using these things, figuring out how it works or does not work with their pattern of use. Some people are going to be solidly in the camp for foldables, particularly those who wanted one to begin with. Some will rationalize that they wanted one and despite problems will continue using it based on that rational.
But, I believe, over time there are going to be a sizable group of people who decide that a foldable doesn't work for them. Others will decide that it does and you're going to end up with (I think) a group of customers equivalent to those who want the iPhone Mini to return.
There is not going to be some revolution where everyone saw the light and the Apple foldable became and will remain Apple's biggest selling iPhone. It's not going to happen. And the customer base that does buy the foldable will be insufficient for Apple to continue making them.
It's a fad with legs, but ultimately those legs will give out when the fad is over. It's already happening. It's just that the die hards for foldables are vocal.
We're going to disagree on this, but it's just my opinion. Until things actually happen (or not) it's open season as to whether I'm right or wrong.