I mean, we may not get first week sales higher than this, but there's still 2D Mario, Tomadachi Life, Nintendogs, and Mario Kart 9 they could put out to expand the userbase.It's sort of funny to think that ACNH is likely the "last" huge Switch title Nintendo could have possibly released to expand its userbase. There's no going higher than this.
More mature games like Bayonetta, Metroid Prime, and the like aren't going to sell anywhere close to Animal Crossing, but they will expand the Switch audience to a different crowd.