Anyway, I've played through with ChantrySeb before and I just wanted to throttle him. Hello, what about all those people in Starkhaven that your family has been ruling justly for generations? You're just going to leave them hanging with a puppet ruler because you're so brainwashed by the Chantry? Yeah, you do some good. Little things that fit in line with who the Chantry wants you to be. Selfishness and cowardice at its worst.
I'm not a fan of how the player is given the option to influence Sebastian's beliefs and in the end that has absolutely no bearing on events (well, if you don't kill Anders, anyway? I'm not sure if a befriended Sebastian still returns to Starkhaven if you killed Anders)
At this point in time it seems unlikely that Sebastian will appear in Inquisition, or even get an offhand reference. BioWare confirmed that when they pulled the plug on the DA2 expansion and DLC, Hawke's story and her companions' stories were over and would not come up in a game again. And now we know that the Free Marches will not be included in Inquisition... so no visiting Starkhaven.

Maybe... maybe I was foolishly reading way more into his subplot than I should have, but I can't shake the feeling that it was left open-ended because BioWare intended to do more with it, and it kills me that I will never find out. Women who friendmanced him at least got some banter about a wedding. I'm
never going to hear about the lavish royal wedding between the Prince of Starkhaven and the Viscountess of Kirkwall...