I've always found the practicalities of this pretty limited as while you "can" watch someone on a TV in another room, half the fun is watching them "physically" playing - not to mention the practicalities of calling through to your friend in the other room very annoying for other people in the house.
How are you currently getting your Vive cable to your PC if it's in another room? Surely just run the HDMI cable for the TV the same was you do the Vive cable? I mean if you're running the Vive cable through a wall and the TV is on the other side of the room from the "vive hole" then I can imagine it would still be a pain.
Don't get me wrong, the fact the Steam Link supports it is great, but literally every time I've come up with a use case myself a HDMI cable has always been a totally perfect replacement.