Never thought I'd see the day that a Zelda game would be at 23.1M, and still going at the pace it is. Back in 2016 I was thinking 5M would be a decent expectation for the new mainline Zelda game, after we knew a decent amount about the game. When A Link Between Worlds released I was hoping the retro-style would have an NSMB-like nostalgia effect on fans and finally take the series to 10M.
But here we are today, it couldn't have gone better for the series.