My bad then, I swear I thought 3ds alone was going to end up with 70m ltd

It's worth noting that while the combined userbase of 3DS and Wii U may currently represent about 73 million systems, it doesn't represent 73 million actual consumers, as a lot of Wii U owners are also 3DS owners, and a lot of 3DS owners will own more than one model.

So even if everyone who bought an 8th gen Nintendo system buys a Switch, that's still probably quite a bit less than 70 million. And that's before you factor in that, inevitably, some Wii U/3DS owners will not get a Switch.

I don't mean to rain on everyone's parade, I'm just suggesting a little caution for the moment. Remember, a lot of people predicted Wii U would sell over 70 million. Let's not get carried away before we even know its price and software.

Prediction: It will probably do better than Wii U, but not as good as 3DS. 100m seems way too hopeful.

Switch can also sell to those who never bought either platform though (one example being Vita owners) so again it's not wild prediction, if priced right I can see it doing fine because it doesn't have brand confusion like the Wii U, the concept is much clearer than with Wii U and it's very likely it'll have a unified library unlike Wii U. Remember a lot of people also wrote off the Wii as well.

Every sale not from a Nintendo fan will have to be clawed from the fingers of Playstation/Xbox/mobile, and that's an uphill battle. Not to say they won't win some over, but it's far from a given. As for the unified library, Nintendo announcing they'll continue supporting 3DS kinda kills that idea.

They only need some of from that userbase though not all it's far from a given much like your argument about the current owners not migrating is far from a given either, 3DS is just doing what GBA did during the DS launch year and acting as a buffer after next year the won't be any more 3DS games, remember Wii U was to be continued to be supported guess how that's gone.

3DS support also doesn't negate a unified library either as do you honestly think they'll continue to put all their big first party titles on it instead of Switch.

Nintendo's trend for the past 6 years has been one of users migrating away; whether that will change with Switch remains to be seen, and hopefully it does, but there is a downward trend that Switch will have to reverse before it can start gaining ground. For Nintendo's sake, I hope 3DS is killed off soon. If they stubbornly keep it on life support, one of Switch's biggest potential advantages, a unified library, will go down the drain.

A downward trend if you ignore the DS and Wii sure but those two prove they can very much reverse things especially when they start up a new brand. DS was also around for a year after 3DS launched it's nothing new that's how they've always phased out handhelds it's obvious all the main first party titles are already being readied for Switch.

With Sony releasing PS4Pro now I don't think we will see PS5 for the next 2 years, so there is a possibility of it crossing 80M, but I agree with you that 100M may be a hard task.

The times of GB micro are long gone, people wanted smaller cellphones but now want bigger smartphones so I agree that not fitting the pocket isn't the biggest issue (but the sheer size can make it a hard competition against smartphones).

No problem, 3DS may achieve 70M I don't know, I was just saying that at the moment the sum is close to 70 (someone said 73), so I don't think it will cross 80M-85M on the sum because WiiU won't achieve more than 15M.

They may release one or two crossgen and they would be suporting it after Switch, but they will probably kill support as they done in the past, but they can't say that right now since they want to sell on Holidays (same reason why they won't release more information before january or preffers to say Switch is first and foremost a home console).

I'd call anything below 50m a failure. Even 50 or 60m would show that the Nintendo and handheld fanbase has massively declined. Anything above 60m I'd call a success, though I don't see that yet.