Personally, I don't mind if they convert 1st to 15th gen (plus D1 and D2) into 3 teams, as long as all of them can be fitted into the mains (as in shonichi members). But that would mean the maximum is 48 senior members. Right now they are at 57. They can simply ignore it and go ahead with it, but I would be really sad for those seniors. If people want a team with lots of 16th gen members in it, I think it would be better to fill team AKB with at least 16 senior AKB members and you will be left with 9 senior members for T4 which the rest of it can be filled with 16th gen. So 7 members would be promoted to T4 and the rest will serve as KKS. Also I haven't really factoring any kennin in it, which would complicate matters. But kennin won't perform a lot anyway, so I don't think it would really matter in the long run.