We've had this same poll nine months ago and these were the results:

I think it's appropriate to give it another shot when ~75% of predictions have already been proven to be wrong, with another 18% to follow soon. Personally, I had voted 30.1-32.5 million back then, but in my defense, I wasn't aware that Isabelle and Doom Guy were a couple.

Here's how its shipments have progressed over time:

March 2020 - 11.77m/11.77m
June 2020 - 10.63m/20.40m
September 2020 - 3.64m/26.04m
December 2020 - 5.14m/31.18m

So once again, what are your lifetime sales expectations for Animal Crossing: New Horizons?

...

Bonus question: Have you purchased Animal Crossing: New Horizons?

Where did you get the December data?

Go back to the home page and look. You'll find out soon.

Nintendo published their financial results earlier today.

You can look up all the latest hardware and software figures in this spreadsheet. Alternatively, you can go to Nintendo's corporate website and view their various documents:

https://www.nintendo.co.jp/ir/en/

Yeah, I found it in the Nintendo forum, but there isn't anything on the home page.

Me think 45M approx. is a fair assessment as of now, but I'm not going against the belief that it might do even better.

Bonus question : No, sims game are not my cup of tea.

Put me down for 55 mil.
I also believe MK8DX could manage the same and that the two of them will be neck and neck, if MK9 doesn't release until the next sysytem that is.

I voted for the 55-55.9 range, though I imagine it would be closer to 55 than 60. I also think ACNH will not be the best selling Switch game, even if it briefly overtakes MK8 DX soon. I think ACNH could reach 40 million by the end of 2021 (only 2 Nintendo titles hit 40 million on a single system before Switch!).

This will be interesting to look back on this time next year! I find it hard to imagine how ACNH will sell than 8.82 million in 2021 (the exact number needed to reach 40M), coming off of it selling over 30M in 2020 (less than a year on the market). The game will continue to receive updates, which will keep it in the public eye (even if its small updates...to be fair, MK8 DX hasn't had big updates). The pandemic will still impact us going forward this year (although that does have negative impacts, in addition to the positive impacts of being at home).

I think around 41 million. Not really confident with that because it could easily smash that number, but I'll got with it.

Edit: About the bonus question. Yeah, I bought it day one, played it for thirty hours and then sold it. Got enough out of it. 

I voted "more than 40 million" the last time, and this time I'll go with 55-59.9 million.

Bonus: no, doesn't look like something I'd have that much fun with.