And, for just 100$ you can buy NOW a Nokia 1.3 with x4 the specs of the first iPhone. You're basically saying that if the trends change you need to have a 24 airbags car with all the drive assists and autopilot, at the same price as a car from the 20' that had only a cassette player and a fuel indicator.
So next time, rather than using an invented logic, use REAL logic!
If milk goes from 2 dollars to 4 dollars, that means iphone going from 100 to 200 would be same logic, apply new found tech on that and suddenly you have more expensive stuff as well. If we didn't had one carton of milk increasing in the first place (milk is just example, put any unchanged item of past 30 years) we would have iphones cheaper as well.
Yes, I believe that whatever the price of a car today is, should be the price of a car in 2040, or at least go up as much as our salary. If my salary was 100k when first iphone came out and 200k now, I do not want to see iphone go from 100 to 1000.