Many young people live by themselves and can't afford a "huge" TV. Meanwhile VR will give them a virtual TV as big as they like.
Another potential future technology that might obsolete the current 55-85 inch typical TV sizes is "OLED wallpaper", or something similar that would allow wall-sized televisions.
Even before the 2030s I expect something like quantum nanorods to replace OLED panels, potentially allowing up to 10,000 nits in an affordable panel that doesn't suffer from burn-in.
On another front, I've noticed a lot more people watching something like TikTok, YouTube, or Netflix on their hand-held devices instead of traditional TV. I can picture a future super-thin, super-light Apple iPad with an OLED HDR display becoming very popular, especially for people on a budget that can't afford a huge TV.
You are likely right about your specific use cases. Though you might also want to see how early on some people predicted that TV would never take off, because families just didn't have the time for it.
We don't have a TV at home, and we would just do different activities in the situations you described. (But, yes, those activities in these situations would likely not include hanging out with headsets on.)