If 3rd parties support it and they do multiple upgrades like the PS4 and PS4 Pro, over 100 mil easy.
Worst case senario I see it doing 3DS numbers as it SHOULD have a combined library of Nintendo's console and handheld caliber games. More software equals more reasons to buy afterall.
If none of this happens and Nintendo for some reason makes a 3DS successor, Switch will likely flop however.
All in all, I think it is most likely that Nintendo and the Switch have a bright future ahead of it. They are in a good position to make this a hit and will have to really mess up for it to flat out fail. Still, there are a lot of factors that we still do not know so we will have to wait and see how it plays out.
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