I think the last part of your statement says ALOT. very few if any are going to live off online poker and the pros who did play for sites were funded solely by the sites and never had to put there own money up and still couldnt make it. Before black friday im sure there were those that could live off online poker, i just dont see it being feasible these days
There have certainly been people making money from online poker even after Black Friday, and I dont think, anyone was ever sponsored by a
poker site without being a pro already. Some like Daniel Negreanu came from a live background and ended up losing online, but others have made significant money online, and some still do.
If you look at the overall picture though, most on the online pros are now from countries, where living costs are low, and where often these is no significant live poker scene. And for these guys it still makes sense. But if you are from a high income country, there are better career plans than to become a full time grinder.
Online poker can still be a nice side hustle though, as long as playing also bring enjoyment. Some people claim, that online poker is dead, but I wonder, when these people last played the micros? There are still plenty of fish and gamblers giving away their money, but they tend to give away 5$ at a time rather than 50 or 500.