1- Nintendo absolutely would and does. If you need proof, note that they are the only one of the 3 that consistently has mass shortages on launch, and for long periods afterwards. Either they have the worst manufacturing team in the business for the last thirty years, or theyre deliberately shorting. They have been caught over, and over and over shorting supply. Again, thye think theyre a toy company, and this is absolutely how toy companies operate. Interestingly enough, this is exactly what brought down Disney Infinity. They blew out v.1, and then grossly over manufactured 2.0. This sunk the entire endeavor, because they were stuck with millions of unsold figures that cost them many dollars each to manufacture. I believe Kotaku cited that they sold a milllion hulk figure, but they made two million. As far as jeopardizing the other platforms, theyre not. People are used to updates, they frankly wont even really notice. Heck I just got Wheel of Fortune on disc, it had a larger update than the disc install as well.
There is of course a secondary, less likely explanation, which I dont believe applies here. One way to get a discount on replication is to give it to them with a large space of time before you need them. Replicators will give discounts, sometimes large ones, for flexibility on when they run your discs. They want their lines moving 24 hours a day, and having things ready to run when someone is late in delivering assets, or the stamper has defects, or any number of issues is handy. So they take the things that wont change and submit it.
2- its still People he trained, basing their work on tech he developed. The Wolfenstein for 360 that was undoubtedly the base of Wolf 2 on Switch was id tech 5, which was developed for Rage by Carmack. I doubt 6 is even close to a rewrite. Carmack designed 5 to scale down to iPhones, he was thinking mobile about ten years ago.
3- the sales numbers, using COD as an extreme example, were pithy by comparison. And dont forget that Wii users didnt buy DLC in any noticeable amount either. So not only did all of Wii COD combined sell less than a single 360 release, but there was none of that season pass income to be had. Certainly there are titles that appeal to the Nintendo audience that sold well like Just Dance and Rayman. Rock Band is a great example. The DLC and online were shut down on it long in advance of the post RB3 pause. Because no one was buying it. Look at the list of Best selling, even million plus selling WiI games, you have to hit thr botttom of the list to find a game that isnt squarely in the Nintendo wheelhouse
https://en.m.wikipedia.org/wiki/List_of_best-selling_Wii_video_games Third parties started bailing on Wii in its second year, and jumped ship even faster with WiiU. While the numbers are inflated, virtually all the best sellers were hardware pack ins, it sold games for Nintendo, but with a few exceptions no one else. And you cant support a platform without those third party royalties, even if youre selling hardware at a profit. Something that is more and more true every single day. If the Switch is moving third party AAA type software in large numbers 3 years in, Im sure theyll reconsider. But i seriously doubt this will be the case.
4- it was far easier to scale the games down to Wii from 360. The way new AAA games today are far and away beyond what the Switch could handle. Large online experiences in particular. No, this doesnt affect indie style games. But if they say, want Red Dead 2 on it, Id be very very surprised if thst were to come abiut, as thats a complete ground up custom version. Something that was done. Their modern warfare and ghostbusters for example.
If I were Nintendo, I would have bailed out after WiiU. Used my clout to get long term, highly lucrative terms from the major distribution platforms, and start shipping games there and everywhere. Its obvious Microsoft for example senses that the Rare IP isnt as supportable on their own platform as they would like. Pure speculation, I wouldnt be surprised to see a cross platform release as part of their new crossplay agreement. What better way to make a new Conker, or finally get that goldeneye remake rotting on a shelf released. Its not going to last, just like it burned out for Wii.