first device to unify their hardware, software & userbase, 85 million is certainly not out of the question.

Fewer than Wii more than 3DS. So probably 85-95 million.

WiiU owners overlap with 3DS owners, a huge chunk of whom bought multiple 3DS revisions. And unifiying their hardware also means that their games have to have a higher budget and will take longer to make.

Personally, with 3rd parties starting to jump on board like 2K and Ubisoft, I feel more will come down the road, and as a result games like that in the future will be on Switch.

As for numbers, I see no less than 80 million. I think my max as of no huge surprises yet would be 115 million. However, there may be some huge surprises down the road.

80-110 million

I didn't know that GB/GBC, GBA, DS and Wii are not Nintendo systems. :)

Also, Switch is console that will be bought buy handheld and home console users in same time, it will have multiple revisions similar like 3DS, and it will have very strong support of Nintendo in any case (unified platform). So 85m definitely isn't too high and definatly is possible, we already seeing how huge demand for Switch is.

Too early IMO, I would say at least 50m+ in any case, but how much exactly (50m, 60m, 70m, 80m, 90m...) its hard to say right now, If I need to choose I would say around 80m.

Some are desperate to erased them from history, it has been happening for years here.

Yup, Nintendo haters always act like DS and Wii never happened, it's really said. I also forget to mentione GB/GBC and GBA.