Can we calm down on the Morrigan hate and Abelas talk? This is the Solas thread. There is another thread for Abelas and if you feel the need, you can make one to talk about not liking Morrigan.
If we tied it back to how it relates to Solas, would that be okay?
I personally really like Morrigan, but that was poor form on her part. I don't adore Abelas thanks to his "shadows wearing vallaslin; you are not my people!" comment, but I do feel bad for him and could grow to like him if we got to know him more in less... tense... circumstances. First time I played, I really didn't want to have to kill him, and so chose my words carefully trying to find a peaceful compromise. So happy it worked out. As for Solas, the above video is the first time I've seen "Morrigan drinks from the Well" footage. I was surprised to see a big hunking "Solas Approves," after his "You are a glutton before a feast! You can't be trusted!" talk.
My Lavellan drank from the Well because, like Abelas, she didn't want her people's knowledge leaving the People. Also, like she thought Solas felt, didn't feel she could fully trust the knowledge with Morrigan. Then she got "Solas Disapproves" while drinking, and returned to Skyhold only to find him chewing her out over drinking from it. It's like, "I thought you didn't want Morrigan to have it! And you didn't want to drink from it either! I solved that problem!"
After seeing the end credits, it makes sense now. It's likely he was just using reverse-psychology to get her to drink the Well. Oops. Sorry to throw a wrench in your plans, Solas.