The idea of Pokémon is for you to take them with you to be social and trade and battle with your friends. This is the core ethos of Pokémon. It is what the developers continually say is the core thing of the game.
A home console version would lose that. While it'd have battling and trades online, it just goes against the whole idea that Pokémon is meant to be portable.
MMORPGs would need a massive overhault of the entire engine, battles etc. to work so, if they were to ever do an MMORPG, it'd have to be a spin-off like PokéPark. That could happen, but main series...no