It will most likely be sooner then 20 years when we all switch to Waterborne , as its being pushed all across the US , and I will be shooting it in my shop the 15th of this month , cant wait either as the peeling paint of years ago was due to an E-coat problem not a base coat problem . Was drying to fast and the base had no time to LOCK into the E-coat , and with the help of the UV rays , the base didnt have a chance .

I shoot anywhere from 3 - 7 jobs a day in a downdraft heat makeup booth , and just switching to water borne will be like not spraying 2500 cars a year , with the solvent type bases used now .

Waterborne has come light years in advances in the past 15 years .
What most need to worry about is , if you dont do it for a living and have a license ( which is the next level ) to spray you wont be sold paint
I just went to a seminar to get licensed for VOC compliancy , good for 3 years .
EPA & OSHA are trying to come up with ways to stop the hobbiest from just blowing it into the ozone from their garages .

Well off to work