Oh Maker NOOOOOO. I love Morrigan. Her sis-mance with my Amell is still one of my favorite video game relationships ever. They were such good friends, and Morrigan's friendship has such weight to it.
Though I'd still pick Solas. And then my Amell would have some angry words at the end of a fireball for my Lavellan.
Morrigan has become my favorite character (with Cassandra a close second). So if I went with that, bye-bye Solas.
However, should it ever come to being forced to choose between Solas and her, I'd pick whoever seemed more likely not to doom all of Thedas. At this point, hard to say which horse I should bet on... no idea what absorbing Mythal did to Solas. No idea what getting Mythal's godhood might do to Morrigan if that happens/happened. We don't know what Solas is about to do, nor if Morrigan has a big agenda of her own...
I think their paths will cross again, and it should be very entertaining. I can already hear Mythal's chuckle in my head. *starts making fade popcorn for DA4*