How relevant is this forum to the survival of Bitcoin because thinking about it this is a good forum where everyone with an interest in Bitcoin gathers to actually learn and interact but what if something happens and the forum shuts down tomorrow suddenly, will that instill fear in the hearts of investors who are also members of this forum?
There are more investors of BTC who are not aware of this forum's existence than who are, so I don't think it'd matter much to BTC's survival if this forum were to disappear.
Personally, I consider Bitcoin and Bitcointalk to be inseparable, so I may feel Bitcoin to be incomplete if this forum were to disappear, and that feeling may last for a while, but we move on sooner or later.