Maxal, hope for the best, plan for the worst!
You are already planning for the worst, which is always good, but don't lose faith and keep hoping that Adolin will get a good resolution (okay, not good, as nothing short of an entire pov book would be good, but sufficient resolution). I was just reading a reddit thread of your favorite moments of SA and over one third were Adolin's duel, and Adolin offs Sadeas. I find it hard to believe an author as skilled as Brandon would make a character which so many people are paying close attention to (even if he got said character by accident) and then just remove him because he wasn't part of the orginal outline. One of his traits is that Brandon does not kill characters for the shock of it, or because it is/isn't expected, he does with his characters what feels right, and I find it hard to believe tossing out Adolin will feel right to anyone.
Personally, I am fully behind you (although I really don't want him to lose his shardblade, that would be almost like losing part of his soul), Adolin is my favorite Kholin, Jasnah is close behind, but still on second place, Dalinar, my main issue with him is his ocassional blindness and how he treats Adolin and Elhokar respectively, Renarin...I don't feel I've seen enough of him to say anything, he seems nice enough but always falls into the background for me on all his scenes due to how Adolin is usually there (of course, I get that that is probably how we are meant to feel), Elhokar...well not much of a fan. But overall, the Kholin family feels very tightly knit together, and Adolin been kicked out would most likely shake the foundations quite badly, specially considering that Jasnah would likely just ask why they didn't send assasins after sadeas earlier on. And using Adolin been sent out of the action to "evolve" the other kholins just feels cheap. Adolin's thread has been one of the most anticipated for oathbringer, a bust there would dissapoint many, even if just a slight bad feeling (not just us Adolin groupies ).