HDMI over Cat6 would bypass the need for Win7+ and Steam Home-Streaming. You would no longer be relying on your network bandwidth. Rather, your connection would be from the host GPU via HDMI --> HDMI HDBaseT Transmitter --> patch panel via Cat6 --> Cat6 drop --> HDBaseT Receiver --> HDMI to LCD/TV. USB extension would be similar.
Again, if you use an HDMI Matrix Switch (ie 10x10), you could get a very clean setup to all the Receivers you want.
@LinusTech I hope you reconsider your final thoughts as I think HDBaseT and USB over Cat6 should solve any drawbacks described in the video. I am actually 3/4 through my own 3 HTPC+NAS, 1 CPU project inspired by your videos. It would be awesome to see the 10 Gamers, 1 CPU come out flawless and without issues. I'm a 1300+ VM, 40+ host VMWare vSphere Datacenter System Admin and always come back to your videos everyday for enjoyment!