Well, the "multiple Switches per household" thing has come true in my household at least; my little brother got tired of having to share my Switch and me not letting him take it on the go, so he has just bought his own.
EB Games had a big discount with the Switch marked down to $400 AUD, so he took the plunge.
This is a guy who by the way has a gaming PC stronger than an Xbox One X.
Nice to see how your household has transformed from "after the Wii U there's no trust for Nintendo's next console" to multiple units being present.
Usually I'd expect a situation of multiple units for a household only to happen to after price cuts and/or revisions, but your brother isn't lacking in his gaming budget when he has such a powerful gaming PC.