That would probably work for hobbyists, but I have my doubts that professionals, who rely on Adobe products for their livelihood, could use unsuitable software for years in the hopes that volunteer devs will eventually add the features they need. In the other post about this topic, someone commented that GIMP’s devs are refusing to fix problems that are repelling new users, which is not going to encourage Adobe users to make the switch. GIMP still doesn’t have fully functioning, reliable non-destructive editing, which is 100% essential for anyone beholden to a boss or client who is going to change their minds a couple of times between now and next month.
Adobe is big because of their userbase, but their userbase is big because they make genuinely powerful software that fits the needs of professionals. The free options (and the cheap proprietary options) are not there yet, and probably never will be. Professionals aren’t going to switch until the features they need are there (because seriously, why would anyone use a tool for their job that doesn’t actually allow them to do their job properly?), but the features aren’t going to be added until the professionals switch over. Catch22.