Did you know that what you are suggesting already exists? Bitcointalk isn't the only forum on the w.w.w.
really whats the adress of that altcoin or better cryptocurrency forum
Well I don't know exactly what he was talking about, but there are definitely forums for
Dash and doge (on Reddit) that I've seen--and both were pretty dead last I checked, because they don't have signature campaigns. And it's too bad, because those coins had such good communities (don't burn me at the stake here). At least they are/were hardcore enthusiasts.
Then there's also the Serious Discussion and Ivory Tower sections of bitcointalk. OP might not be aware that these exist, but there's definitely no spamming allowed there.
Edit: Someone last year tried to start a forum called ICOdiscuss.com or something similar, and it failed miserably because he tried to recruit people (shitposters) from bitcointalk to participate, even going so far as to hire moderators (not shitposters). It didn't work because once the guy stopped paying people to be there, there was no incentive for them to keep posting there. Let's face it, would you rather post on a forum that
doesn't pay than one where you
are getting paid? So I'd say most ideas to start altcoin/ICO boards are doomed from the start--because of bitcointalk and its structure.