For me? Pretty much.
I held on for a few years because I used 3.5 oz tanks on VSC guns. I have since switched over to various bottomlined setups so I just use my HPA tank(s) on my pumps now. And if I were to ever switch back to VSC, I would probably use an 8/3000 tank.
Back home it was always easier to get an HPA tank filled but CO2 was still an option; here in Vancouver it is basically impossible to get a CO2 fill. I will continue to use 12 grams for stock class, but I am liking the consistency and ease of using HPA too much to go back. Not to mention that it works on all my guns with no fiddling about.