"as far as being a professional artist, well guess what; when I was a kid I wanted to be a poet."You were certainly not representative of the typical American kid.
"If ever a time comes when one could sustainably make money selling art, then I'm sure many artists and even non artists will flood the market."
I'm not. Not until they can make a better living at it than most other professions.
The sad fact is that not only is making art looked down on in this society (as "emo", or "gay", or as not serious or worthwhile), but most people are not interested in expressing themselves artistically (partially as a result of the education system, and partially because of social attitudes towards artists and art).
Maybe as kids, a minority of Americans enjoyed an art class here and there, but they probably never dreamed of creating art for a living -- even if it somehow could earn them a decent wage (which it can't now.. not even remotely).
So I don't think even economic parity with other respected professions would suddenly flood the market with artists. Not until societal attitudes and the education system changes pretty radically. Until then, people will still want to go in to a more respectable and "achievable" career path.
Sure, if there's suddenly a swarm of artist billionaires like there has been of dotcom billionaires, then many money-hungry people will swarm in to the art field (as they have in to the startup industry). But I for one am not holding my breath.