Cross-brand marketing battle goes to Amazon. Hands down.
But by then, I think BTN will do an ala carte stream that won't "require" cable or satellite subscription. Imagine getting THAT in your mail. "Get BTN app for $6.95/month! No contract required!". For the record, BTN gets $2 or less per cable subscriber nationwide. They wouldn't even "need" the "outside the B1G market" that Comcast is dumping. But they would get some of it, in spades, and Comcast would bleed out that many more subscribers.
Cable/satellite companies are supremely stupid. They actually think people "need" them. The only "need" these days is for live sports. Fewer and fewer people watch their non-sports TV programming "live" anymore.