Less than the 3DS.

It's actually low if it's supposed to include holiday sales. 5 years worth of 200k weekly sales only amount to 52M, or 10.4M a year. That's just slightly above Xbox One numbers. 250-300k weekly seem more realistic at this time if you want them to include holiday sales.

im going with the 60m range

Switch keep selling better than 3DS in same time period and that's without any price cut still while 3DS needed to have huge price cut only 6 months after launch in order to start selling. So LT Switch will not have any problem reaching at least 80m, 3DS probably will not hit 80m. I mean at end of second full year for Switch, it will already be somewhere around half of 3DS numbers.

Have a look here, you'll see that the Switch is outselling last year almost every week save for March and April due to being the launch months, but June and July only made the gap grow bigger and bigger. If you take the 1.2 million from launch week out of the equation (which is only fair considering you're cutting out the 2 first months of this year too), then Switch is selling better than last year in the same timeframe by half a million.

You're also not considering future releases. Smash and Pokémon are both much bigger than a 3D Mario, and Super Mario Party alone should already about equal Odyssey in hardware sales push. Add to this the fact that Switch had no Black Friday deals last year but certainly will have this year, and possibly even a pricecut to boot, I'd say sales October through December should be much higher than last year's sales. Add to this that Switch is outselling 2017 on a weekly basis right now and it should be clear that 2017 will be beaten by a country mile.

We’ll see. Official Switch shipment numbers are outpacing the 3DS shipment numbers by 3.5% but the 3DS had its life prolonged thanks to Pokemon Go.

And what the end of the Switch’s second full year is basically half its life.

Until now, but that difference is getting bigger, Switch is getting momentum, for instance it had best July month in US in last 8 years in gaming. Switch will not have typical life of Nintendo home console, it will have life span similar to handheld and 3DS because of its hybrid nature and future revisions, Nintendo said they want Switch to have longer life span than typical 6 years.

I really don't know.

Launch numbers are boosted compared to normal sales. You include the launc. If you look here, the Switch did sold in March a lot less than 2017 (because that was launch-month) and a little less in April. Since then it sold this year more each month. If you exclude March as launch month and count all together (so April-July), it adds up to 2,503,168 in 2017 and 3,140,294 in 2018. So Switch is indeed stronger this year.

Switch is thrashing the 3DS in the US and Europe, fact is 3DS was never that popular outside of Japan. Switch is gaining mass acceptance because it can play more console styles of games that the 3DS couldn't handle.

You can't have a game on the 3DS that makes people go "wow" the way Breath of the Wild does.