Indeed, hence my point if they took over the BT coverage it would become effectively live and remove most of the delay.
I guess this is something that Sky have considered with their Sky Glass service to look at ways to remove the latency. I also saw that Amazon were aiming for a 5 second max...
Would solve a lot of their issues with lagging service via streaming - would have a 'live' stream and multiple channels to broadcast.
Good place to show their sports documentaries too, some of which are excellent.