I really want this as well, but I'm a bit sceptical: would any company release a product soooo good so that their users don't need to buy new models of such product for many years?
I still have a 2015 MBP that works like the first day although I would like to increase the disk and ram. 5 years with the same model; that's a lot. I know many people who replaces their laptops every 2 or 3 years. Now, I have the impression that a model like the one you just described, is a model that could easily "last" for more than 5 years without trouble. Wouldn't that hurt Apple's sales long-term?