Ah, I messed up and forgot the 'see results' option. That are probably the XB1-voters.

I do think PS4 will outsell the Switch lifetime because the hardware, for one, didn't age quite as fast as the Switch (which will hopefully offer a mid-gen upgrade like the other two).

Mainly, though, it's because they probably had the least competition for a huge portion of their run than any console since the first few years of the Atari VCS in NA. I really can't think of an example where a console had only two competitors, and both competitors absolutely face-planted and botched their entries from the start.

The end result was that the PS4 was simultaneously affordable and the strongest hardware-wise (that almost never happens), not held down by expensive peripherals, was the best system for multiplats, had a strong first party lineup, and was really just the logical choice for almost everyone.

We might not see such a favorable climate for a console to sell well again going forward. I don't think the Switch can ever catch that even if it does sell extremely well.

Nah. both will likely be in the 100-120m range. I don't think one will have a big advantage in another one.

Well I guess as you haven't responded you didn't give it that much thought. It's more of a wish then a prediction I suppose.

If the Switch is at 12.5M at the end of 2017 it will be 1.3M ahead of the PS4 at the same time. But! because of the misaligned launches the PS4 was ramping up to the end of the year so it sold 3 million units in that time frame. 1.7M units in January and February isn't a certainty. Heck, it's not even a certainty that the Switch hits 12.5M units at the end of 2017. That's still 2.4M units in the last 3 weeks of December after taking what was probably 40+ days to do it that same amount over November and the first week+ of December...

Yeah, my money is STILL on the PS4. But right now, The Switch is on par with the PS4 on the timeline. Let's see how the Switch continues to sell after the holidays. :)

I think the Switch will have an unusual trajectory, but in the end it will win both the home and handheld markets for Generation 9 with one console.

Hard to predict exactly, because Generation 9 will be unusual, while Generation 8 is a fairly predictable generation.  It's basically like Gen 6.  Think about Generation 7, though.  The vast majority of people were off on a year by year basis throughout Gen 7, and even those who knew what was going to happen could at best give an accurate 1 year projection of numbers.

So Gen 9 will not be quite as wild as Gen 7, but it will be a lot harder to predict than Gen 8.  The best I can say is that the Switch's sales trajectory will be a lot like the DS's trajectory (with a few exceptions that I will state below).  The DS's hardware sales went like this

Year 1 - 3m (3m)
Year 2 - 11.5m (14.5m)
Year 3 - 21m (35.5m)
Year 4 - 29m (64.5m)
Year 5 - 31.5m (96m)
Year 6 - 29m (125m)
Years 7-10 29m (154m) 

(I am ending each year at Dec. 31 in the above numbers.)

The Switch's sales are going to look like that with the following adjustments: Year end this year we mostly know will be 12-15m sales.  Year 2 will be same or somewhat less than DS (0-50% less).  Years 3 - 6 will be same or somewhat more than DS (0-50% more each year).  And Switch will have very good tail end sales for years 7+ (50-150% more than DS). 

I know that is a big range, but exact numbers are hard to predict.  Overall what I am saying is that Switch is going to win both the home and handheld markets, and that is why it is going to be the best selling console yet.

My NSW prediction.

2017 - 14m - 14m
2018 - 25m - 39m
2019 - 24m - 53m
2020 - 20m - 72m
2021 - 16m - 88m
2022 - 14m - 102m
2023 - 7m - 109m / New Nintendo console year
2024 - 3m - 112m
2025 - 1m - 113m

Nope, I don't see that happening.

The Switch will NOT sell over 20 million consoles in ANY given year. That's my prediction. :)