There will be support from 8th and 9th gen 3rd parties and Xbox, something the OG switch lacked.
Nintendo itself is also growing.

Yes. All plattformes had a boost. But while Xboxone was so small it did not effect anything, PS4 was not even able to be remotly close to last years numbers. A boost there was in fact! Yes here i am with you. But it did not prolong gen 8 and it went down faster than gen 7. (Xbox 360 2005- 2016/ PS3 2006- 2017-----> XboxOne 2013- 2020/ PS4 2013- 2022- if we go for active lifetime as of hardware production and shipment). So if anything, Covid shortened the generation, especially their hardware legs. Would it be different (longer/ shorter) without Covid? We will never know, but i highly doubt the cycle would have gone on much longer...

The biggest benefit from Covid would actually have been the Xbox series S.

Maybe Nintendo really should have added Covid19 in SSB (Covid 19 tests positive for battle!) Everyone gets infected. As it does basically nothing to younger charakters like the Splatoon Inklings, older Charakters (for example Maroo, Link, Kirby- the so called "high risk group") gets wiped off the stage quite easily when getting hit. Hits also add more %points to the damage. I would have absolutley done it if i was Nintendo, also to make restriction fanatics looking like fools🤣😂.

I agree, but it wasn't shortened because of the covid, but because Microsoft didn't want to support and produce the XB1 after XBSX released, and because Sony .. well maybe the same thing, they continue to produce the PS4 in low volumes, but they didn't even cut the price, they didn't do any marketing and they didn't had enough production for the PS4. I am not sure if the production thing was because of covid. But they wanted fast transition, and didn't want to hold on to PS4 much after the PS5 released.

I think sales fell down so fast that it wasn't worth it to continue production at all. That goes for the Xbox one as well as for the PS4. Right bow there are 3 current sytems in production: The Switch, the PS5 and the Xbox Series X/S [(i count it as 1 (family of) system(s)]. Was there ever a time when less different systems where on the market? 

I expect it to be about the same as the first Switch, just an upgraded iteration of the same thing. There's direct competition from the Steam Deck and others now, though.

Also, without the Covid, Phil Spencer would have admitted the lost in the Console Wars a year early.

I think it's difficult to argue against a Covid boost, but also you're right that the increase in Switch sales was not exclusively influenced by Covid. Typically there are a myriad of factors that influence a certain outcome. Heck, I bet quite a few people used their US Covid stimulus checks to buy a Switch!

I absolutely don’t argue that COVID had an impact on the sales of the Switch (and every other industry involving people staying home). I only have to state that it isn’t like the Switch was failing or flailing prior to the pandemic. Nintendo teed themselves up for success and certainly was able to reap the benefits of the crisis. I haven’t seen any speculation on the exact level of benefit COVID brought to the platform, but I could see it selling 10 million less if the pandemic hadn’t happened. 

Nntendo performed a clinic on how to support a console for 8 years this generation. That has more to do with the success than anything else.