For quantity (just like r/bitcoin), Bitcoin Talk UI/UX should evolve just like Reddit.
For quality, spam should be eradicated and less strict moderation.
But i don't see both option will happen anytime soon.
What remains on the forum are the people who are interested in the more detailed, "specialized" parts of blockchain, trading and new projects.
But that limited to tech-savvy or geek, most developer (even Bitcoin Core developer) don't use or stopped using this forum.