A foldable iPhone will definitely solve one of the biggest problems at Apple. Foldable phones won't last 5-10 years. I can see Apple making all iPhone offerings foldable down the road
My non-techie parents pretty much always get the latest non-Pro iPhone every couple years because their carrier calls them and practically begs them to take a new phone.
It's extremely rare to see anyone with a phone older than like 4 years.