I don't know that streaming will ever work let alone be the future. It sucks and there's no easy way to fix it.
I do agree that the NFL will see a decline but the base is strong enough to stabilize it. They still have a huge challenge in front of them. Video recorders have taken some of the value out of live advertising, they've already maxed out the stadium dollars and for various reasons the excitement has been diluted.
The NFL needs Directv way more than Directv needs the NFL now.