Not to mention that the Johto region will be significantly more difficult to implement here than one would think. PokeMMO has traditionally (to my understanding anyways) obtained most of the assets like NPCs, Maps, Storyline, Tilesets, etc from the ROM Files that we are required to download to even access whichever region we were trying to access.
Johto includes a future-version of Kanto in every game that featured Johto (Gold, Silver, Crystal, Heartgold, Soulsilver) - There's going to need to be an addition step there when the region DOES go into development in the future.