I've known quite a few people who made quite good livings playing 5-nights a week at hotel lounges in BFE. You're not going to recognize any, because they aren't famous, they just made their living going around playing music and weren't super famous. Even the relatively "famous" ones I have worked with (say, marc benno or paul pearcy or jay boy adams) aren't known by folks outside of very small circles.
IME, the consolidation of radio, changes in taste around live music, and the dissolution of paying for recorded music all worked to get rid of that group of folks.
But that doesn't mean that I haven't played with a lot of folks who are now in their 70s and 80s who made a good living playing music for folks.
Thanks for the names that you provided. I'd say these are examples of people that had some success and then pivoted to become session / touring musicians for other (very famous) bands (though one is a Grammy award winner in their own right). I suppose it is possible that there will be fewer people like that in the future. I guess we will see.
Perhaps the artist in the article could similarly pivot. At least, that seems to be the main way to stay in the industry if you are unable (for whatever reason) to attain commercial success.
James Keelaghan, Stephen Fearing, Skinny Puppy...hundreds more.
Also, the comment you replied to said that those names he mentioned were the relatively famous ones. The ones who are less famous than that will not have the success you mentioned. They will simply be people who had mid-level success in an industry that could support them.