Something like 'Obsession' over a TV show just sounds silly, and not very Space Opera-like. If Oath or Obsession are to have any impact at all, it should be something big, like restoring the Jedi or defeating the Empire or re-establishing the glory of the Mandalorians, or freeing Kashyyyk. Something that might drive the character on, not a silly distraction like in the 'Holiday Special'.
And even then, I can't see these things are 'Obligations', because you're not obligated to anyone beyond yourself. If you stop doing them, nobody else will care.
The actual description for obsession includes celebrities. It's definitely meant to extend to pop culture, so TV shows (or the SW equivalent) makes sense to me.
Regardless, I've seen you posting your opinion about the certain types of obligation in that if there's not an external force, it can't be an obligation. I have to disagree with you there. The external pressure is the player, or the GM, or the narrative. EotE is, first and foremost, a cooperative storytelling experience. That's why it's structured the way it is and why the dice work the way they do. At the end of the day, if the player is just going to ignore his obligation just because you can't send an NPC after him to kick his ass, then it might not be the right game for that player and it's definitely not the right obligation.
With that said, it's easy enough to start implementing penalties to the PC as he continues to ignore it. A strain threshold or Discipline reduction that can only be removed after addressing the obligation can go a long way to kicking the player's ass into gear.