Sure, but all of them will assuredly have a direct official USB-C replacement, that is also better in other ways(i.e over the base iphone 14, besides usb-c, the base 15 also gains the A16 SoC and dynamic island), in the near future. Nobody is saying get rid of those older devices just to be on the new standard, but eventually people WILL upgrade. Whether that be for new features,faster performance, better audio quality, or just plain wanting to be done with Lightning, something will cause them to upgrade.

Despite being obsolete in every single possible way, this isn't the case for micro-usb. Unlike with Apple devices where there's always a tangible, if maybe not worthwhile, upgrade on the newer model, there are SO many things micro-usb is used on that NEVER need to be replaced unless it physically breaks. Until they literally break, my micro-usb charged flashlight is just as good as my usb-c flashlight, my decade old alarm clock powered by micro-usb is just as good as a brand new usb-c alarm clock, etc...