In the early days of television, most of the programs were family shows. With only three stations for most viewers, it could be counted on that friends, families, and neighbors were watching and following the same shows. This tended to unite families and communities with a common interest.
Today, there are so many channels and programs that watching television tends to be a pastime for individuals. Although a popular show might unite a certain demographic, it will usually fail to unite even a family on any given night, let alone the neighborhood or community.
I rarely watch television, but I can't say that I would be willing to give it up altogether. It can be a lot of fun watching with friends and family or snuggling with your partner under the light of a flickering screen. Having said that, I agree with your underlying point that too much television robs relationships of the intimacy that comes from fully focusing on each other.