> Blackouts exist to limit the extent that remote viewing substitutes for live attendance
Y'all are confusing your words. "Blackouts" you describe are local TV broadcast blackouts if they don't sell out the stadium. "Blackouts" the GP describes are the blackouts on Sunday ticket because you are supposed to watch them locally.
Opinions: The former is good, it forces attendance. The latter is not, as it puts prevents regions that otherwise can't watch the games locally from being able to watch them at all (due to poor blackout zoning). MLB.TV is about to enter a lawsuit about this very thing, and though they'll likely win, it is a huge problem.
Couple that with the ESPN's and others having a hatred for cord-cutters and you have an area ripe for disruption, even though the sports leagues themselves can hold it down w/ their anti-trust exemptions and unfair practices. But that won't last forever once the Googles and Netflixes have the capital to force the leagues' hands.