The cost for interactive video would be a requirement of 10x bandwidth, basically to cover idle time. Not efficient but not impossible, and definitely wouldn’t change ISP business models.
The latency benefit would outweigh the cost. Just absolutely instant video interaction.
It is fascinating to think that before digital circuits phone calls were accomplished by an end-to-end electrical connection between the handsets. What luxury that must have been! If only those ancestors of ours had modems and computers to use those excellent connections for low-latency gaming... :-)
You’re arguing for a reduction in quality in internet services. People do notice those things. It’s like claiming people don’t care about slimmer iPhones. They do.
The latency benefit would outweigh the cost. Just absolutely instant video interaction.