I really don't think it is going to be DLC. The setup at the end was leading into another story that changes the world completely. My impression is the with Origins, it was a complete story as was II. Now it seems the writers have all the lore together, a plan, and are going to continue on this ancient elf path. Too much for DLC. I still really believe the Inquisitor will be the protagonist of the next one.
As for the racism, I really don't believe that is what it is. You have to look at it from the perspective that he knows what things were like. With Sera, it's a matter of knowing the potential and the beauty of their culture and she outright rejects even acknowledging that she is a part of it. This is not a commentary on the perfection of elves. They were far from perfect, but there were things worth saving. He know these things and I think it hurts him to see her like that. I think his anger at the Dalish was more their inability to admit they may be wrong rather than them actually being wrong. He has a different perspective and can't outright tell people.
I generally think that what happened was:
1. The elven gods were somehow causing misery amongst the people, possibly from sparring amongst themselves. The exception perhaps being Mythal who seems to be relatively well regarded amongst the people and maybe was holding things together for a time.
2. We know she was murdered but I really can't think of who. Flemeth said that she was betrayed and that the world was betrayed which means it was something very big and I don't know if the other gods would have been capable of such a betrayal. The Maker maybe? Perhaps the pettiness of the gods made him turn his back and Chantry wasn't completely wrong. Murder being a very loose term because she somehow managed to survive possibly by reaching out to Flemeth but as a shadow of her former self.
3. Fen'harel locks the golds away out of revenge for Mythal? To contain the chaos and help the people? Then falls into sleep.
4. Flash forward, Solas wakes up and gives his sphere to Corypheus? Possibly to get the charge necessary to open it and Corypheus obviously takes it and causes his own havoc. Solas is of course, distraught from this does everything he can to get his sphere back and close the breach.
5. Solas finds Mythal/Flemeth. I don't think they met before this. He probably learned of her survival or sensed her and saught her out after the events.
6. He apologizes for his mistakes and she apologizes I believe for needing to punish him. However, he is not ready to go because he thinks he is needed to help/put the world back together and absorbs whatever he does from her.
The next game is definately going to be dealing with this. As Flemeth said, Mythal was going to have retribution that would shake the very heavens. Luckily, as Morrigan says, the Inquisition is ready to handle what ever happens.
Solas is just the best character for this because of his ambiguity. He wants to help, you want to think what he does is right, but when it comes to changing the world, things are just unsettling. I don't think he is a bad man but a desperate man. He is grasping at pieces trying to put things back together to save everyone.
BTW. Wonderful art and fanfics everyone! My hubby is making fun of me for spending so much time look at things. 