The issue with this is that having to change out the screen or chipset would alienate the average consumer unless you could somehow make it super simple where they just pop in and out. But with a design like that I doubt the build quality would be very robust, which would be a terrible idea for a system meant to be used on the go. And if the consumer doesn't do it themselves then do they pay a fee for Nintendo to do it? Does Nintendo eat the cost of doing it for free whenever someone upgrades? Plus, if Nintendo is doing the upgrade then it would require mailing in your Switch and waiting to get it back, which costs both money and time.
It's a neat idea, but it seems very impractical especially since most people don't mind having generations.







