DlC is crap. All of it. Forever. And ever.
That being said I agree with all of the things said by frezgle and artemis.
Pokemon started the concept of pre-loaded DLC many years ago, so I'm glad masuda saw the monster they unleashed and is against it.
Someone said that the games would become unlimited with DLC, I don't think it means what he thinks it means, The very concept of DLC, microtransactions, MMOs and even cloud gaming have a expiration date; it's hardcoded ito the concept itself.
Take mass effect, for example, now it's all great, but when in several years I install the trilogy again for my children to play (because I have the physical discs, not a steam copy. Who knows what will happen to steam in the future?) they will be missing huge and important chunks of one of the best stories in gaming.
DLC might not be essential (ideally no, but that's hardly the case) but in cases of new areas, sidequests, cutscenes, additional plot development and more, those things are as part of the game as what came in the disc.
Continuing with my example: in the future, without arrival, my kids won't get why the batarians hate shepard and the scale of the conflict they are inmersed in, without overlord, they won't see the lenghts cerberus will go to achieve its objectives, without leviathan and the extended cut, that piece of **** ending will be a slap in the face, like the first time I saw it; omega effectively ends a whole character arc (Aria's), from ashes gives you one of the best weapons in the game, a kickass character, incredible insights into one of the most interesting races in the ME universe and a huge deal of character development for liara, and citadel seems to be a better reward for the player than those crappy, last minute, "we had no idea players wouldn't like a horrible ending" DLCs.
My point is, those kind of DLCs are part of the game, and they only last as long as the publisher and the developer continue to support them. Wi-fi mystery gift is already an in-game, free DLC, and events are a form of (only sometimes) free "locational" DLC, So pokemon doesn't need DLC because it already has it, since its beginings, and the only thing DLC could be useful for is delivering events worldwide (as I said, wi-fi mystery gift) or increased customization options for characters (assuming the game is already well stocked of options, and the addition of more doesn't make the others useless).
Sorry for the rant, but DLC is a double bladed weapon, and in the long run, hurts the players more than the developers.