I thought of the pregnancy angle at first, too, but I would be nervous now about Theresa being pregnant as she has continued drinking since that night she and Brady had sex. Unless they are planning another story similar to JT, but I don't know if Brady and Theresa would be able to handle a child with special needs the way Bo and Hope did.
I know she's not popular on these boards but I really like Theresa and I hope the writers find a way to get her out of this situation with John. I still think if the writers aren't lazy about it, it could be seen that she hit him in the heat of the moment. As for her wanting him to stay in the coma or to die from his injury, it is a typical soap plot point that a person who commits a crime does everything they can to cover it up. Kate and Lucas did that to Sami when Lucas killed Franco. Look at what Sami, Kate, and Gabi did last year by throwing Nick in the river. Theresa is reacting similarly the way Gabi did after that incident.
I would also like to see a situation where if John comes out of his coma, he and Theresa find a way to work through their issues and become friends in the future. Hey, Sami and John were able to work through their differences even when Sami drugged John (during her time as Stan). That is why I want a way for Theresa to get out of this situation and hopefully get a redemption arc for her character. Whether she moves forward with Brady or not remains to be seen.