Well, EEs will still remain as the only real buffers, where the more energy = the more buff, without any limit.
So in case the AE is banned, all guilds will play only with EEs, not with EEs + AEs.
Later Edit: To make it more clear, the only buffer builds that will be affected by the future changes will be EBK & ERF, since this are the only 2 boring buffer builds to play. ESMs are still good in terms of damage / impact outside of Mana Shield and the EE will always remain as a buffer class for CS, that needs more activity & management compared to EBK/ERF that only gets in range, press 1 button and then leave range.