That said, this post is a lamentation directed more broadly towards excessive media and social coverage, which can sometimes suck the imagination out of some great entertainment... because we just can't wait.
Examples are all around us. It may be that badly cut movie trailer that gives the whole story away. It might be that book review that takes the fun out of reading the book. Or, it might be your friend who doesn't realize what not to say about a film others haven't yet seen. And, as you'll soon see with the Smash example, sometimes even production teams behind these shows are complicit.
I understand the reason for casting announcements. But, let's call a spade a spade. Announcements that confirm the exits of key characters is a window into next season's storyline. Though NBC made sure to include a disclaimer stating that some or all departing actors would be back to "tie up loose ends" (paraphrase), a spoiler by any other name is still a spoiler.
Why are we obsessed with this stuff? We didn't used to be.
But it shouldn't make good marketing sense.
It takes a tremendous effort to give the world a piece of art. I think it's our job as the consumer to enjoy it as intended... all in good time.