I agree with what you're saying to the fullest extent. I bought ttk, but this morning i was looking at how much i would be left out if i didn't. You should still be able to play nightfalls. You should still be able to play every crucible playlist that was available before. I think Bungie/Activision have it in their heads that if you were be planning to be playing destiny beyond this point, you were most likely going to get ttk anyway. Or at least thats what they'd like us to think.