It's not really an arranged marriage, all Jasnah did was say I think my apprentice would make a god wife for Adolin. Adolin, Elhokar, Dalinar, or Navini could of just said no and that was it, basically it's like if someone's brother told them that they found the perfect person for them, they meet and then they fall in love, because Adolin is in love, I'm not for sure if Shallan is in love.
I also want it to be over because I don't want more conflict between Kaladin and Adolin after them just resolving their conflict.