I know Apple always things it's a closed system, but my gut feeling says the later.. More and more of this stuff starts out Apple-only, then opens the door further, to the point you almost can't really call it a "closed system" anymore for that specific feature-set. Although, good for Apple and other devices as well, its all makes Apple happy..
But still, diverting more and more from a once closed system. They keep trying to defend this statement, and they are loosing the further they go. Apple music on Andoid, Airplay was once only for Apple devices and a select few phones...
Now its turned into smart TV's as well.. Being Apple as they are, they would still hold limitations, so I don't reckon will be all fun and games.