PS4 was $399 it's first three years. Base PS4 now is $299 without a game. PS4 PRO which is the main model now is $399.99.

Also, Wii started better than both, and it fell off like a rock after 2010. With nexgen approaching, I don't see the switch doing crazy numbers once it reaches 65 million,

Wii was selling to a casual/non-traditional audience so once the novelty wore off sales plummeted. That doesnt apply to Switch since it is selling to a more hardcore/traditional gaming audience.

Next-gen is irrelevant, if PS4/XBO & NSW have had no notable affect on each others sales than there is no reason to believe PS5/XB4 & NSW will all of a sudden start harming each other.

Switch will likely start to decline around the time PS5/XB4 launch but that will be due to a natural sales curve rather than outside factors coming into play.

Mhm 3 years into the generation, PS4 sales were peaking, and they stayed really high the following year. By the time PS5 comes out it would be switch year 3. That's a pretty pre mature sales decline. 

Year 4, Switch released in March 2017, it's in year 3 now. A 3rd year peak followed by a small decline in year 4 is a pretty normal sales curve.

2013 2014 2015 2016 2017(peak year 5) 2018(sustained peak) year 6

ps4 peaked year 5/6 

so switch peaking in year 4 is pre mature. 

It released in mid-November so counting 2013 as year 1 makes literally no sense at all. Also 2018 had a 10% decline, that's not "sustaining its peak", thats a decline.

Besides, who cares when PS4 peaked? It had a later than normal peak, good for it but peaking in year 3 or 4 has been a very common thing for consoles.

What are you getting out of making nonsense arguments?

"PS4 was $399 it's first three years"

Yes and not up against considerable competition.

I'll give you there's less incentive to own multiple than, say, a 3DS. But like you said, there's still more incentive to own multiple than a PS4. Anecdotally, when I was doing Christmas shopping for my nephews the year we got them their Switches I initially insisted on one for them to share. When my mom found out what the Switch was, my explanations didn't matter. To her, it was a handheld that docked to a TV, and as such each of them needed one for themselves.

I agree with you. If a 3DS is a 1 in the "own more than one" factor, a Switch is a .5 and a PS4 is a 0... If we were to assign numbers to this.

So the XBOX ONE, PC, and 3DS/WIIU aren't competition.