The first period of time in which another mainline Animal Crossing game is released on a Nintendo console resolves YES. If this does not happen before January 1, 2030, the "Not before 2030" option resolves YES.
"mainline Animal Crossing game" - a game that is considered by a consensus of credible reporting to be a main part of the Animal Crossing series that is currently comprised of Animal Crossing, AC:WW, AC:CF, AC:NL, and AC:NH. side games like Amiibo Festival would not count
"released" - deliberately made available to the general public in either Japan or the United States, whichever is earlier
"a Nintendo console" - any Nintendo console, including but not limited to the Nintendo Switch or the rumored Switch successor. does not include any Xbox console, any PlayStation console, Android, iOS, or Microsoft Windows