My sense is that this is a guy that feels he is superior to everyone in every way and his main reason for trying new things is to prove that to himself and others. When he finds out that he doesn't have that one in a thousand or one in a million talent or ability for whatever it is he moves on to try something else because his self ego is so inflated he is still sure that he will have superhuman talent and ability for the next thing and for everything else out there and still maintains in his mind that he could have been the best in that too except that he "lost interest". It is called denial.
There is no problem in searching for what you are best at (and what you hopefully enjoy too). There is however a problem when you are in denial and continue to think you can be the absolute best at everything when the facts say otherwise. He moves on when something doesn't back up and collaborate his inflated self image instead of learning from it and just being honest about his true abilities. Like almost every other human, he is going to suck at a lot of things, be decent at a good many, real good at a few, and truly great at the one in a thousand level at none or maybe one if he is lucky.
He is in search of any fact (being great at something) to help support his belief (that is can be truly great and a master at anything) instead of just believing what all the facts actually say (that like almost every other human he is going to suck at a lot of things, be pretty decent at a good many, real good at a few, and truly great at the one in a thousand level at none or maybe one if he is lucky). Over inflated ego and inability to deal with facts and reality is his real issue and when something doesn't jive with his ego he moves on.
Like many on here you seem very angry, and for what? Some kid thinks he's going to be a "Canadian pro-level player" (which has allready been established not to be an actual professional, but just a very good player). I don't think that is very far fetched at all. His timeframe is short, but with dedication it could have been done. To me he seemed to have a decent amount of talent too, he certainly wasn't talentless by any stretch of the imagination. You are all talking like he's trying to become the first man on Mars, with a C- grade average! I've told this story before, but I saw a guy go from absolute beginner D- to A- in a year. THAT is superhuman talent. Getting to A speed or slightly above in 5 years certainly takes a lot of talent, but it's far from a superhuman feat. Skill develops both steadily and in leaps and it's not always easy to tell how talented someone is, down to 3 decimal points, btw. You often can't tell until after the fact.
The guy didn't quit his job to pursue this career, he's still young and still has options. We should be glad someone does have passion and desire to become great, otherwise, based on the odds, nobody would ever attempt anything difficult. We'd all be ditch-diggers and NOBODY would ever try to be good at pool.
I think there are more than one person on this forum with inflated egos, btw. You guys are psycho-analysing people like Sigmund Freud, making extremely speculative leaps based on very little input. I'd be terrified to have someone like that be in a position of power over me...
It seems every now and then people come on here to proclaim their goals to become good at pool. If it seems unrealistic, I'd treat that pretty much like I'd treat anyone saying that in a pool hall. Just go "uh-huh" and let it go. Instead he gets angry lectures from the ambition police! Some seem genuinly offended, even! "I spent 5 years becoming an APA 5, therefore it cannot be done." Give me a f-ing break! By doing that you are in fact showing YOUR limited exposure to truely talented players, not the other way around! All the best players I know were REALLY good after 5 years, good enough to compete with the best and not be embarrased in most cases. Of course they need time to become truely polished players, but they were still able to win in some cases. With raw shooting ability you can upset a lot of people in this game. As I understood it, this was the kind of level he was shooting for.
It saddens me how people take every opportunity to drag others down into the mud, wether it be female players, amateurs who are enthusiastic about the game or others who dare to dream. What the hell is wrong with you people?