I guess so.
But it's not like games like SMRPG don't have a bunch of exclusive stuff that can add to Smash. Besides, based on what PushDustIn said, Sakurai's statement was vague enough to where he could've literally just been referring to characters.
Like I said, I don't think future DLC will be focused on first party or existing world additions, but that does not discount the possibility of them happening. And Super Mario RPG is such an entirely disconnected world from the rest of both Mario RPGs, Mario mainstream, and Square Enix properties that I think it definitely fits the "new world" criteria well enough. It did at least get a Super Smash Bros. X Super Mario RPG logo when the Mii costume was revealed. So, I do think it operates a little differently.
I think a Xenoblade character and Geno are the two most likely "current franchises" to get into Smash. Xenoblade just has so much working towards it and only the first game is represented in any capacity. Geno has the Sakurai bias and a fairly unique world. And both characters have huge amounts of fan support and only exist as Spirits (and the Rex Mii costume).
My issue is the rest of how Sakurai talks means that the one mistranslated bit doesn't discount the rest of the context. Here's a transcript of the English:
"Finally, it was announced that we will be working on even more DLC fighters. To me, it feels like the finish line is sliding farther away. You may wonder, how much longer can he be involved in Super Smash Bros. Ultimate?
But I'm also excited. Adding more characters into the game means more game worlds will be added to the series and ultimately, that means there will be an even greater opportunity to delight the fans. At the same time, I feel that Super Smash Bros. Ultimate is now representing so many characters and game worlds that it has become an enormous game.
Even if the Super Smash Bros. series continues moving forward, I doubt there will ever be an opportunity to bring this many characters together again. So I want to keep improving on this record as much as possible, and I will continue to work hard at developing the game. I appreciate your support."
The footage also has specifically labeled for part of this presentation: "We will bring more game worlds together" and "There may never be another opportunity to have this many games world together."
Again, the context heavily implies that Sakurai is going to continue his focus on bringing in new game worlds. I can accept that one part of it was a translation error, but there's much more there that still hints at that being his focus. We obviously won't know for certain until we see the characters themselves, but I don't really see many other ways to take this clip.
Seeing a surprising amount of people suddenly believe Travis Touchdown is likely to be a newcomer. I'd love that, Suda's been begging for it since Brawl
I went all in on Travis after the announcement of more DLC. Suda is one of the few Japanese developers that is generally well known and also still absent from the game outside of a "Special Thanks" credit (which in of itself is kind of a big deal). He's a fan of Smash and good friends with Sakurai, so that positions him in a similar place as Snake. And then No More Heroes is a classic Wii series going through a resurgence. It just makes so much damn sense.
I can't wait to end up completely wrong about this one... BRING TRAVIS IN SMASH DAMN IT!