I voted yes... I'm obviously a little biased
I would be up for heading up a Black Team if you guys decide to have another one. I've enjoyed keeping up with the numbers, etc and I've also enjoyed getting to know all the ladies who have been active participants on the team (even a 4th cousin of mine who I never knew existed!!!)
The one chat for all mankind is a good idea, I agree with Hun.E.B about people signing up and never participating in chat - so it would be great for EVERYONE to participate.
Maybe you could allow those who want to stay in the challenge on their respective team stay where they're at (especially the "active" participants) and then fill the empty spots at random with new people who want to join in (up to a certain designated number that would be chosen by Chellez)? I know we've lost a huge number of ladies since the beginning of the challenge, so there's definitely available spots.
Also, I would have no problem switching over to the "red and blue team" rules. I'm not sure if there are any huge differences other than the weigh-in deadlines.... so, that wouldn't be a big deal at all.