That would be fine if all multiplayer was through the Internet and you
had to download updates to play, but what do you do about the people that
never connect to the Internet to play--they just went out to a store, bought a 3DS and physical copy of X/Y, and had their local multiplayer fun without ever connecting to a router. Sure, the 3DS encourages you to connect, but what if you don't? I, er, already
made a post about this, so I won't go on any more, but I wouldn't be so quick to think it's possible to update every game in every situation. Then again, I might not have any idea what I'm talking about, so you might just want to ignore me.