GH85Carrera -- re 16" tires -- while I agree that the 245/45-16 size needed for 16x9 tires are getting rarer than hens teeth, I'm still seeing broad availability in the 205/55-16 and 225/50-16 sizes used for 16x6, 16x7 and 16x8 wheels, with tire manufacturers continuing to offer these sizes with new offerings as well.
Just stumbled on the following links, that list the various car makes/models that use these tire sizes -- as you'll see, a pretty broad spectrum of cars use the 205/55-16 and 225/50-16 sizes, making it likely that these sizes will continue to be produced to fill demand.
List of vehicles that use 205/55R16 Tires - Wheel-Size.com List of vehicles that use 225/50R16 Tires - Wheel-Size.com
Conversely, given the very limited list of vehicles that use 245/45-16 tires, it's not surprising that these are hard to find.
So, what am I missing here? While I'm still comfortable that I'll be able to find NICE (and use-appropriate) tires in the 205/55=16 and 225/50-16 sizes that I use, I want to be sure I'm looking out for the future.