I don't think there's a direct correlation between a good idea and or interest in pursuing it. The idea may simply not cross the threshold of what you want to send time on.

This also may be one of those things that's not a billion dollar idea, or a million dollar idea, but just a 'couple of thousand dollars' idea. Some people aren't willing to spend time on things that don't cross that money threshold, but others most be willing to do it.

That's a good point. On the other hand one may have ideas that are not pursued because of: lack of domain expertise, lack of capital, family commitments, etc.

Exactly this. If I woke up with a million-$ idea tomorrow, chances are good I could not just get up and just pursue it. Why not let someone else take the chance?

Add to this that, as time progresses, more and more ideas that are doable by a person (or a small group) are already done. So your idea needs to solve its problem better (by whatever metric, e.g. price/usability/...).

This is somewhat countered by improved tooling (e.g. stripe, node.js, $stack_of_the_week) and cheaper tech (e.g. raw compute power), as well as by growing and better interconnected global markets (the global equivalent to opening a specialty shop in a tiny village or a booming mega city).

I get your quote, but some people like myself get stuck when we try to think of fun side project ideas or app ideas to build something. This helps people like that who just need a little push in the right direction.

Maybe "idea" is a too vague term here. I'm not thinking about business and large scale things. Only small little things that are in the "sideproject" category. And it's not that it's not good enough for me but having a full time job and other responsibilities seriously limits my abilities for execution.

Here the "refinement" of the ideas could be shared like it is in a company environment or in the open source development space (but that is more the execution part).

Other than that I see your point and that's why I was (and still is) unsure about this. Maybe it can never work in practice...