I'm pretty sure setting up an AI is NO easy task for the GMs alone, so then trying to have that for the users to use at their own will? That would probably be a nightmare for them. Not to mention this would be a mechanic change and would thus be left to the Japanese team to do. Needless to say I highly doubt this would ever happen. The only NPCs there will ever be most liekly are the ones there are now, with new ones coming in the future most likely, along with maybe another event one like Batora. But a npc for each user? Never, I don't see much of a use in this. If you want to fight decks go to the arena, or go to chat and ask someone to play you in training with something specific.
We may not be the strongest but we shall fight to the end! Let us spread our wings and soar to VICTORY!
Twilight Angels ☽