It says I never voted on this.
Before launch I’d have voted 40M, so 40-50 probably, though if I had been pessimistic the day I voted I’d probably have voted 30-40 instead. My reasoning was that the concept of the Switch would catch on in Japan, so it’d sell 3DS numbers there, but would fail in the west. I think I upped my prediction to 64M shortly after launch but obviously that turns out to be much too low as well.