Good time to ask this again. It's almost 2 years since I did the first Switch sales total poll of the week - https://gamrconnect.vgchartz.com/thread.php?id=237351
That time around the 66-80 million mark was the most popular option, with 81-95 a very close second. Both now seem very under-optimistic, but that's with the benefit of hindsight.
I went with 96-110 at the time and I think that's still looking pretty reasonable tbh.
Since we're at the console's peak right now I'm expecting this poll's results to end up being over-optimistic, in contrast to last time, as people get carried away with the figures it's currently posting and feel like the days of summer will never end (or be a longer way off than they in fact are).
Huh, totally forgot about even voting in that but apparently I had the same estimate. Can't remember what my reasoning was at all.
At this point I'm far more optimistic about Switch's future. It may be peaking now, but whereas many seem to believe it'll still fall off and stumble towards it's final years, I feel they have a lot of big hitters preparing for the second half of it's life, that'll help sustain high numbers for a while.
The fact that right now Switch is coasting on the sales momentum of Animal Crossing, a beast that no one was prepared for, epitomises how Switch has been able to blow expectations apart on several fronts.
If there was ever the time for more people to become bold, it's probably now.
I'll still put it just at 130.0 - 139.9 million. I'm feeling 135m is good for now. 5m more than PS4, which I'm guessing will sneak over 130m.
Bonus answer: One, and one (unless there's a Switch Pro or something crazy).