Funny how you associate 'colours' with 'eras'. Red/Grey on black I have fond memories of BBC, just got online, first real online BB community I participated in, blah blah blah.
The 'green' era I associate with pop-ups and flame wars, it got ugly enough for me to migrate over here virtually from the word go, and for quite a while this was a smaller, friendlier alternative to the BBC. The BBC was getting the hits, the posts and Pinky/Morg/Zombie/Acerak/Neo going at each other with big sticks. Then of course, people gradually migrated over here.
It's changing all the time, there's now of course the GW BB forum, there's an awful lot of leagues with their own dedicated forums (and don't think we don't spy on you ECBBL boys!

) and of course there's now forums on the NAF site.
I think there's room for all, there doesn't have to be one 'dominant' site at the expense of the others.
So good luck to Andy and whatever he's got planned for the BBC, I'm certainly looking forward to seeing what's coming up, but I believe the days of one 'be all and end all' site are over, too many changes over the last few years...