I'm trying to stay away from Sun and Moon spoilers. I came back first to discuss the Sun and Moon demo, and now the Switch, but I'll probably leave again until the games come out.
For me personally, I don't really play any third party games except for the Sonic the Hedgehog series, and they've already announced their next game is going to be on the Switch, so it really doesn't matter to me how well it's supported by third parties, but seeing as I don't want to see a repeat of the Wii U (where I think it's a wonderful console, and everyone else seems to hate it), it is probably in my best interest to hope the support is good.