Our answer to new forum requests is generally "no" anyhow, but it's especially no for forums that wouldn't generate a lot of traffic on their own. GG&P takes the better part of 3 days to cycle a thread off of the first page. That's not nearly enough traffic to justify a new forum, as the resulting forums would risk being so small as to lack enough posters to make them viable.
Partitioning the forums just because you can't get along with someone else is not a good reason for a new forum.