You want to romance Varric and I totally understand why you'd want Bianca to be the bad guy to clear the way for him to move on and be happy with someone else.
Mort...
Did you read my post about Bianca? My ideas that she could be a good guy, either trying to help us with the Red Templars or otherwise passing information onto the the Inquisitor? That only one of my ideas involved her being a bad guy in any way?
I'm sorry, but I never ever said that I "wanted her to be the bad guy in order to romance him." Please don't put words in my mouth. 
Again, Bianca isn't why I think he might not be a romance. These are the reasons that I think he might not be available that have nothing to do with Fade Nightmares, or Bianca:
1) He's hundreds of miles away from home. As the devs pointed out, the Wounded Coast was too far out of town for him. He might not be able to open up because of being that far out of his comfort zone.
2) He might not feel that this is the best time for romance with the Fade Tears everywhere, and might want to stay focused only the mission and staying alive.
3) Being too worried about losing his friends again like he did after Kirkwall when the companions split ways.
4) He might still feel quite guilty over his accidental hand in the Kirkwall Incident. I can see that kind of guilt and pain eating at someone after awhile.
5) On a real world level, dwarves usually the least played race, which automatically drops LI chances.
6) BioWare hasn't done a dwarven romance yet, and I don't entirely expect them to.
I can understand why you are doubting so much, but it isn't over until the devs tell us such. I have a feeling that we're not going to have to wait much longer. 