Though I personally think any combination of PS/Nintendo, Xbox/Nintendo or PC/Nintendo... or PC/anything for that matter... is more beneficial for the overall selection of different experiences than say, Xbox/PS. Especially this generation, last gen was different.
That's of course all down to tastes though. Some people just don't like they type of games Nintendo makes, their art styles etc. but love the shit out of Uncharted, Infamous, God of War, Halo, Gears, Crackdown etc. and love the Xbox/PS combo still. The selection of experiences really doesn't matter that much outside of the hardcore as most people have pretty narrow tastes in games, movies etc. with the diehards being the ones that want a ton of variety.
For me I'm PC/PS4 right now. Probably a 70/30 split I'd guess. I have a Wii U, but haven't used it in probably six months (other than a little Wii Fit).
If I get a Switch, it would probably end up something like 65/25/10 i(PC/PS4/Switch) f I had to guess. That's about what it was between 360/PS3/Wii last gen for me.
So it's just a matter of deciding if the asking price, extra clutter and power usage, for what will probably be 2-5 games a year I want to play. I imagine many others with mild interest in Nintendo are weighing the same types of things. We have more than enough to play on platforms we already have, many with huge backlogs, is the Nintendo variety worth it for us? It's a hard decision for me---realistically I don't need it. Emotionally, I want it as I have a ton of nostalgia from growing up a Nintendo fan, have a shelf full of 25ish Amiibo that seem even sillier if I don't have a system to use them with etc.