They already did this many years ago. They got rid of R-12 and swapped to R-134a in vehicles and got rid of R-22 and replaced with R-410 and others in commercial refrigeration. Some home appliances also use R-134a.
I got the EPA certification for automotive A/C so I could purchase R-12 but it’s hard to find now and if you do find it $45-50 for a 12 oz can.
So is 134A going away?
I just blow out all the old oil and get a new drier for the old R12 systems, then refill them with new PAG and R134A. Works just fine... Been doing that since they came out with the 134A, The mechanical system is not smart enough to know what it is compressing, condensing, and evaporating. :)
The conversions were a scam...