Probably, the forum would more or less become "useless" and the whole point of it being a forum would be non-existing.
It has already become largely unfit for purpose. The vast majority of people posting here are just those churning out one/two liners for payment )or farming) and that much is obvious if you spend a few minutes reading a random thread in Bitcoin Discussion.
I honestly have no clue why theymos hasn't bothered to release the official rules for this forum, if there's no official rules, people will think of this as a decentralized forum.
There are rules, but a lot of the most important ones aren't enforced efficiently (bans or ban evasion to name a couple). The list of rules is also mostly community generated and the rules theymos initially created were very few and consisted of mostly things like no off topic replies. I'm not sure whether he even cares about enforcing half of them, but if certain rules aren't going to be enforced we should just get rid of them and go back to having only a handful of rules and let people already do largely what they want because that's what most do anyway. I don't think we should do this or allow it but not much else we can do about it without theymos' help.
I don't think money is the issue here. There's more to it,than what meets the eye. theymos, it'll take a few minutes, but its for you to address the community about the issues. And where's the new forum? Just give us the answers, and we'll shut our mouths(not really).
He's recently stated he's the only person working on coding it now so that's likely why it's taking so long and he also why he doesn't have much time to commit to admin duties here.
Don't remove everybody's signature, when people spam they are temp banned right? Don't do that, first blacklist their signatures, and if they continue to shitpost, then temp ban, then perma ban. That may or may not help. Global mods should have the ability to blacklist or whitelist signatures.
Blacklisting signatures requires theymos input unless he creates a tool for other staff or admins to use.