Well, he's half right.  PS5 and Series X are not going to slow down Switch at all.  On the other hand, the former two consoles are going to sell sluggishly for the first few years.  Switch is going to affect PS5 and Series X just like Wii affected the sales of PS3 and XBox360.  The Wii sold great for a few years and the other two were sluggish at first.  It didn't have a big effect on their lifetime sales.  Instead is was mostly a delaying effect on their sales.  Switch will have the same delaying effect on PS5 and Series X.

Depends on the definition of "major". I could see the next gen systems cutting a couple million units off Switch. The next gen systems will get more media coverage, and they'll be more often requested on Xmas lists, etc. But, I don't know that we'll even be able to tell, as Switch sales will be more affected by other factors than by the launch of PS and XB.

LOL, how can he has two separate statement, there is no half right and half wrong. When you are  agree with him  it means all of his statement are correct, because it's not based on opinion, it's based on research and study. Your statement is cherry picking ,  and altering the research cause based on scientific method that Mat Piscatella did. You agree with his result but not agree with the cause. And also he never mentioned PS5 sales or xbox sales. He discussing Switch sales. 

Call me when top 10 selling games of Switch aren't 1st party but 3rd party instead. Majority people bought Switch for 1st party, not 3rd party

That's not what happened.

With the exception of the launch window, due to shortages, 360 was outpacing its predecessor the entire time.

Xbox vs 360

Launch-1.5m vs 1.2m

Year 1-6.5m vs 6.8m

Year 2-5.7m vs 7.9m

Year 3-6.2m vs 10.9m

Year 4-4.1m vs 10.2m

Basically they tied for the first year (when Wii wasnt out yet) then 360 started outpacing it.

As for PS3, Wii had little to do with its sluggish sales, it was the ridiculously high price, Blu-Ray not being as big of deal as DVD and the loss of a ton of exclusives.

Wii was like Switch, great sales that were independent of the other consoles and complemented rather than competed with them.

Eh... but the kind of person who may choose to buy a Switch to supplement their PS4 may now also have to consider whether they'd rather upgrade instead. That'd be more felt in 2021 though.

I imagine they'll have some effect but not as much as the NeXtBox / PS5 will have on each other.

Just because a statement is true that doesn't mean the converse of a statement is true.  That is all I meant.  

I must have really touched a nerve with that statement for you to be triggered so badly. 

Are you saying sales were not sluggish for PS3 and XBox360 for the first few years?  Both consoles peaked in 2011 according to VGChartz numbers.  How many other 2nd and 3rd place consoles peak 5-6 years after launch?   

At the same time the Wii actually did peak early.  Wii is up when the others are down.  Then Wii is down and the others are up.  That looks a whole lot like competition.

Normally you seem to know what you are talking about, but these statements I bolded make it seem like you don't believe in competition.  Don't you think any of the consoles are competing with one another?  Why did the SNES sell less than the NES.  Could it be that they bought a Genesis/Megadrive instead?  Why did the PS3 sell less than the PS2?  Is it just a coincidence that the XBox brand sold better in Generation 7 while the Playstation brand sold worse?

I mean, think about what you are actually saying.  These consoles are actually competing.  If one company makes a misstep, that doesn't mean most people just stop playing video games.  They buy a competing console instead.

A statement that is 100% wrong.

Call me when your post has anything to do with the subject at hand.

I can't believe that after so long there's still this much denial. The wii was a huge hit, sony effed up the ps3 AND both of these facts impacted sales of the ps3.

You should specify that it's about existing consoles released many years prior. Consoles of the same generation affect each other a lot.

The problem is,  you are triggering yourself with his statement.