What I don't get of the OP, is why people that doesn't care at all the main story, is now willing to care it on expansion? If they don't care, they don't. And if now you want to care, well, listen to the full story. You don't read a book opening it halfway.

You burned to 50 with fates? Well, good to you, now go burn 51+ with fates again, as long as it is the playstyle you like.