Fewer cars overall should increase the availability for those who need it. Same for drivers overall but most can’t see past the first step which is reducing lanes and parking.

Shimano Cues was recently announced and might help with some of the compatibility issues moving forward. https://bike.shimano.com/en-US/product/component/cues.html

I checked the link but I don't understand what it is. just another component set?

They used to have separate 9, 10 and 11 speed drivetrains where every component was specific to the number of gears you had, and in theory you had to replace the entire drivetrain just to go from a 9-speed cassette to a 10-speed. The CUES version has just a single chain, derailleur, crankset, etc. which all work with all three rear cassettes.