Anyone who predicts must note if he considers it a 3ds replacement!
Some low predictions are completely irrational if are being made with switch considered also a 3ds replacent by the predictor! I guess the high ones are with switch being a 3ds replacement on predictor's mind...

I mean if its also 3ds successor, how can you predict just 20m globally, when there is Japan... ;)

I already gave my perfectly logical reasons.

Think it will sell about 1.5m at launch worldwide.

If there is no 3DS replacement, and all Nintendo games like Pokemon and Fire Emblem etc will be on Switch, I think it can get past 50m lifetime if it starts at a good price

45-50m lifetime

I am going to say less than the 3DS but more than the Wii U!

If this launches at 249$.... and maybe over time goes down to sub 199$.
It could see this doing big numbers.

Like 70-80m.

Maybe Im too optimistic? But I like the concept.

I just want to to be cheap enough for people to buy it alone on the handheld aspect.

And cheap enough that people that buy it mainly to use for a home console, wont main it being a 2nd console maybe.

This one is probably very price sensitive (more than PS4 or XB1).

Throw in good media playback, and allow it to read ebooks, and this thing could be a huge even with casuals not really looking for a game console.

If they keep this ball rolling and the thing is as poweful and cool as NVidia say it is, it will sell out at launch and make 10 million first year with ease.
If the third party support is regular and consistent, 70 million lifetime.

The average of all the predictions in this thread.

Very little to go by, but since they've decided on a tablet format and still somewhat chase a crowded market, I'd say less than the Wii U and 3DS combined for now, which means less than 80-85 million. I'm thinking way less, unless they manage to do something spectacular.
It does several things, but it does nothing that other devices don't already do in principle, and the tablet form factor in a home console environment might be more detrimental than helpful in the end, I still believe that the Gamepad was the main culprit in the Wii U's demise, this appears to be a slightly more streamlined version of basically the same idea, with the added benefit of being an actual portable.
But, even as a portable, I just doubt the tablet form factor in general, click-on controllers have been around for some time now and were never a success; traditional gaming and control schemes and smart device form factor simply aren't a very good match.

Nintendo deserve a lot of praise for being different though, and the base idea seems sound enough, but I have doubts, serious ones at that. Let's hope I'm wrong.
Depending on price and support, and just how much they're going to cater to handheld fans, I might consider buying one though.

70-80 million.