Adding a gaming board is not going to make Bitcointalk great again but it will give a scope for gammer to build their own community like we have gambling community, altcoin community.
I am all up for more boards, but wouldn't it make more sense to first see if there is an actual interest in gaming that would warrant a dedicated board? I just went through few pages on the off-topic board and I didn't see a single gaming thread, which makes me think that there's simply not enough gamers here willing to talk about the subject.