I don't think another forum is needed. There is nothing to be gained from spreading the current user base among multiple sites with different agendas.
I don't think so we need more forums that can spread the knowledge and the technology behind Cryptocurrency, if we want more people coming in this industry we need to build more community, we need to build more network, each forum can work to support each other and be decentralized, we have so many coins in the market and each has it's own function and roadmap and so are forums and community.