Replacing those with a headset would not only give me even MORE room to work with, but it would also save room and clutter in my home because I have a small desk in a small space.
As for TV, it doesn’t matter how big your screen is… a headset can always go bigger, give you better 3D, and do better sound as well unless you already have a surround sound setup. Which you may, but many of us don’t have any of those things. The only real downside I see is the inability to watch with someone, but if my wife and I could both wear headsets and sit on the couch together while ALSO both being in a shared virtual space, somewhere exotic with a giant theatre-size screen? Sounds pretty compelling to me.
I don't look at it as a headset but as a new kind of computer-like device with included display, and it's not even 1.0 yet. The cost seems crazy, but my Mac Studio+Display cost me more. If you think of it as equivalent to that, it's not all that out of line.
Now imagine what it will become, similar to how the iPhone changed massively over the years.