Fireballer in New York I assume.
This is just my opinion, and of course, you do what you think is best - but If im being honest I think we have enough 400 orgs.
Probably be a good time to start a 402k one maybe? You'd then get all the new fighters i'd imagine.
But if you were going to go down the 400k theme, I would market it as open only for 25 year old creations. The 18 year olds overtake the 25 year olds pretty quickly, and soon the 25 year old creations are overpowered.
It would be nice to have a org running where these 25 year old creations can continue - and there is going to be a heap post 400k ID's, especially after the Island is done.
Just my 2 cents