Hypothetical.
Let's say the game didn't get released in Japan, and that it was delayed to add the seven characters that we have data for (Toon Zelda/Toon Sheik/Roy/Mewtwo/Plusle+Minun/etc.).
We get these characters, but the game doesn't come out until April in Japan, and May in America.
In addition, we get a handful (another 10-12 of each) of Pokemon and Assist Trophies, such as Rosellia and Onix, who were cut from the final draft.
Would you be willing to wait even longer?