Popular features like Miiverse and StreetPass were major on the 3DS and Wii U, as StreetPass encouraged you take your 3DS everywhere you go to see other Mii’s and get little goodies from your walk. Sadly it seems that that and Miiverse will be gone for the Switch, as Nintendo stated both are not coming back.
It makes sense to some degree, as both were features built around the Miis and it’s not clear if they want to use them for the Switch hardware and software. But with the platform having a new operating system different from the 3DS and Wii U, they would likely have to rebuild much of what they established on 3DS & Wii U. If that wasn’t cost effective for Nintendo, they likely wouldn’t go after porting those features to the Switch.
Maybe we could see them come back in the future but it’s clear both aren’t making the system’s launch.