Except if phones become too big to fit into any reasonable size pocket – and they are pushing that limit now – they will have to be carried in bags, and then you might as well just get an iPad with 5G.I think people will need to eventually adapt to these changes, just as we did with 3.5” > 4” > 4.7” > 5.5” > 5.8” > 5.4” (minis) > 6.1” > 6.5” > 6.7” and soon to be going into 6.9”.
The Mini iPad is about the same price as the iPhone 13, with all the functionality of the iPhone (and maybe more), but with a much bigger screen (8.3 v. 6.1").
Once you switch to carrying it in a bag the options for larger screens goes up dramatically. Most bags will comfortably carry at least 10" screens. Standard small backpacks will handle much bigger than that. I can comfortably fit my 13.3" M2 Air in mine.
The convenience of phone size is a very real thing, and no marketing or extra features or better tech will ever get around that. I just can't see phones ever getting much bigger than what is currently on offer.