410a Phase Out - Should I Be Stocking Up?

This seems to have not really been in the headlines, but a friend that is an HVAC tech mentioned this to me the other day. Thought this might be a good place to get some insight.

r410a is being phased out and if it follows the trend of r-22, prices will start increasing significantly. I have two compressors that are ~8 years old and I hope to get at least 15 years out of them, should I be stocking up on Freon to avoid crazy prices to recharge them?

He told me there are "drop in" alternative Freon options, but they won't be as efficient and with aging equipment it means it won't likely keep up in the hot summer days.

He also mentioned that the new Freon is "slightly hazardous and slightly flammable" (But better for the environment!) so he wasn't entirely sure what that would mean for new residential equipment, his understanding was that in commercial applications new equipment will be required for leak detection and ventilation in case of Freon leaks.

Anyone in the know have some insight on how to prepare for this? I don't want my "most economical" option to be replacing all my <10 year old equipment in the next couple of years.