One has to say this for Nintendo and Switch - they really nailed the concept of a System Seller! The coverage Zelda is getting is definitely driving people to want a Switch. With such a strong launch title (98% metacritic), and one that has longevity to make up for a lack of a launch library, the value of the Switch in terms of 'having fun' is way up there.
With one game? In that case, the value of Wii U in terms of having fun would be off the charts, correct? That, in and of itself, isn't a very controversial statement (there are some excellent games on the Wii U) but I'm not sure I would use a single title as the yardstick for having fun value.
The take home message for the other console companies is, "this is how to appeal," and that's 'the games'. Not the features. Sticking a next-gen computer eye in the pack or removable controllers or any other feature without world-class software to make it meaningful is pointless. Nintendo did it with Wii, didn't do it with Wii U, and have done it again with Switch, and it's obvious the impact.
What metric are you using to quantify that that is the correct approach that others should use? It would seem to me the obvious one, the one other console companies would likely look at, is sales. Given that it just launched, I'm not sure the data exist to support that statement yet. Further, whether or not sales are spectacular, abysmal or somewhere in between it seems to me that there are other factors that are arguable just as important that one might look at when evaluating the Switch's launch and its overall health down the line for take away lessons. Including price, software lineup (software being used in its wider context), the state of the competition, the state of market its launching in, the positioning of the Switch in that market as a product, and the possible value propositions its offering to various consumers (which will vary by person but I suspect there's a handful of common key value propositions that could be put together). Looking back at some of the past consoles in recent memory those of some of factors that I think could be pointed to as key differentiators that ultimately impacted their overall sales.
If I were in charge, the moment I was given a new hardware concept to develop, I'd go to my software people and make sure that we had the most amazeballs couple of launch titles and include that in the project development as every part as important as the rest of the system.
Having a couple of amazing launch titles seems like solid advice in general. But I think your statement has some obvious assumptions built in, namely nailing the
rest of the launch (including price, software lineup, features, etc.) in
addition to some amazeballs launch titles. I'm not sure a strong argument could be made that Nintendo nailed the rest of the launch of the Switch outside of having an amazing launch game. Which is not to say that's your argument, its just to say that I'm not sure I would use the Switch as an example of a great launch. I suppose time well tell whether those other factors matter or not.
EDIT
TLDR: At the end of the day there are likely several lessons to take away from the launch of the Switch. If it turns out to be an amazing success, as a consumer there are some key lessons there I would rather the other console manufactures not take away and use examples of how to pull off a launch or of what's acceptable. Zelda BoTW quality launch title would be a prime example of what to do, some of the other factors, not so much.