Exactly. Case in point, I bought a Switch, and yes I own a 3DS. But, I also own a Wii U and an Xbox One. The Switch didn't replace my 3DS exclusively. It replaced all of them, because I am using as both a console and a portable.
Also, owning a 3DS or Vita doesn't mean you bought a Switch to replace them. For me, I have a 3DS but didn't have any current gen home consoles until the Switch. When BOTW was announced, I was prepared to get a Wii U to play it, but then the Switch was later announced so I got that instead. And I haven't replaced the 3DS with the Switch--I've bought games for both systems regularly since purchasing the Switch. So for me, the Switch is thought of more as a home console, even though I had a 3DS too.