I'm so sorry to disappoint you, but Switch will never have a user base of 70M when PS5 or Next XBox will be released, I think you should revise your calculations; and even if this will MAGICALLY happen, it won't affect PS5 and Next XBox, 'cause both will be True Next Gen Home Consoles capable of massive AAA 3rd Party titles, while Switch or any Switch revision is just a portable console which can be connected to a TV.

 Then you say :""The technological leap for Microsoft from Xbox One to Xbox 4 is going to be minimal. I mean they are literally talking about ray tracing as the only improvement but still only offering 4k 30fps""

I have no idea which is the source where you are collecting your informations, but according to MS, XBox Anaconda will be an insane piece of Hardware, even much more powerful than X1X.

 People who want a Next Gen Home Console will buy XBox or Playstation, people who prefer a portable which can be attached to a TV, will go with Switch, easy as that.  It doesn't matter which will be the user Base of Switch when PS5 and Next XBox will come out; if you wanna play TLOU Part2 in full glory, or GTAVI, or Forza Horizon5, the Next Halo at native 4K/30-60 fps, the next GOW,  COD, RDR3, and all the best massive AAA 3rd party games on Consoles, you have only 2 options, which is Sony or Microsoft.

 No Switch revision will ever allow you to play the best 3rd party game experience; you will have the small-midium sized games, and even downgraded, and this will get worse year after year.  With this, I'm not saying that Switch is not offering its very unique and interesting game experience; I'm just saying that Nintendo has diverted to another "territory", and will barely affect Sony or MS.   It's all about PS5 and Scarlet, and if they Sony and MS will deliver a great product and presentation, they will be successful like PS4 and 360, respectively.

By March 2019 Switch will have an install base of approximately 37 million based on Nintendo Projections. Somehow you think selling another 33 million between April 2019 and December 2020 is a lot? The best 3rd Party Experience will and always will be PC. So console sales will come down to Exclusives. Which is why I said PS5 will still be successful but will have a smaller life time sales than PS4. Microsoft has already proven they have no traction in the market with flat sales and a major revision (Xbox One to Xbox One X).

You are saying a lot f strange things bro.

Especially that third party nonsense. Especially if using PC as your clutch.

Yes, PC will always have the best (and worst this is a part people conveniently ignore like every PC gamer has a high end rig) versions of Multiplatform games. But that means absolutely nothing in the grand scheme of things because the bulk of all those games gat the majority of their sales from consoles. Look at all of multiplatform games released simultaneously for consoles and PC. You will be hard pressed to find a single one where PC sales make up for more than 10% of the overall games sales.

As fr your PS5 and XB4 comments..... I am just going to continue ignoring them.

Listen, I am really sorry my prediction hurts your feelings. All it was is a prediction, and I could be wrong (and I clearly stated that). Maybe PS5 goes onto outsell the extremely successful PS4, and maybe Microsoft wins the next console war. But my prediction stands and you can ignore it all you want, and when it all plays out we will see who was right. If im wrong im wrong. I don't claim to be a psychic. I am making a prediction based on what I see and I made it clear it depends on what Sony and Microsoft bring to the market. 

P.S. there is nothing strange in what I put. I never said PC outsells Consoles. I said PC offers the best third party experience. 

Switch is quite "near" X1/PS4 graphics. But by next gen time that won't be enough to get ports.

X1 is like 1,2 TF and next gen on 12-15TF level (less than that would be low considering X1X already cross 6TF), I know TF isn't all but just as generic measuring the gap we can stay on it. So if Switch Pro or Switch 2 only get inside 1,2-1,6 TF level of processing power/graphics it won't receive AAA 3rd party (not that it even needs, AA and Indies would be enough to fill the gaps on Nintendo releasing schedule).

More important than reaching near X1 or PS4 level of graphic would be similar tech of PS5 and X2, because not using similar tech (even if a lot less powered) would be worse on the scalability and porting than the pure power gap.

https://www.gamespot.com/articles/apple-says-its-new-ipad-is-as-powerful-as-xbox-one/1100-6462892/

I haven't benchmarked it myself. I am going by what Apple is saying and Phil Spencer himself hasn't shot it down actually complimented the comparison. 

That would require quite the jump in performance. Even the upcoming Snapdragon 8cx only reaches about Switch GPU power (and a Tegra X1 running at full speed still has a 30% faster GPU than that!)

More probably, it's duable to a technicality: XBO calculates FP16 (half precision) at the same speed as FP32 ("full" precision), while mobile chips can calculate those at twice the speed. So in FP16, they could catch up to XBO in GFLOPS due to this. But videogames need FP32 most of the time, so an A12 Bionic wouldn't be able to handle the graphics in those games in any way.

To me its just interesting how much Mobile is closing the gap. December should be a great month for Nintendo. Im looking forward to gaming in 2019.