Animal Crossing is the 2nd biggest title they've got coming out later this year though. If it were just a matter of scheduling, you'd think that it would be Link's Awakening or even Luigi's Mansion that got pushed back. Why would Nintendo skip a holiday cycle for an evergreen title that'll easily sell 10 million?
But Link's Awakening is a remake. Unless it's FFVII remake, I find it hard that a remake would get delayed that far back.
You may have a case for Luigi's Mansion 3, but its planned to be demoed at E3..and I don't think games that are being demoed at E3 are delayed that often.
AC can still sell 10 million w/o a holiday release. It's not a first week sales juggernaut. It's a slow burner compared to Mario, Pokemon, and Smash Bros.