Yes, it is very similar to what Wikipedia does. In fact I'd say the only real distinction is that what I'm describing in theory should enforce evidence far more strictly and on a more granular basis than Wikipedia does with articles.
You have an assert that would comprise of many claims that are all supported independently by sources, and so you would then have a hypothesis and present it as so (as opposed to a fact, which would be a claim and require evidence, but inherently your idea is jus that).
You present your idea on another forum that's eventually made into a fact by empirical evidence and then later link to that, citing your novel idea. This as you imagine is somewhat self-referential and probably wouldn't work at scale.
In that framework you present novel ideas, and they are vetted, somewhere other than the particular forum.
While it is somewhat different in detail, it's conceptually a lot like the Wikipedia model.