Honestly, contemplating a situation where Imlie will not fulfill her duty as a wife being married to a man goes against her social conditioning, which isn't too bad after all.
Just like Aryan said Imlie cannot control others actions, but she can control how she reacts. She is not obligated to fulfill the relationship in any way. And that makes me sad for Aryan. But, I would add that Aryan is no Imlie to keep moping around. He will give Imlie her space and independence and will keep her in line if he seems fit.
I feel this marriage should be of mutual understanding and consent, not coercion, otherwise it is pointless right. Imlie ke saath wohi cycle dauhrana, is traumatic.
Although I want the marriage to happen later, I would go for a marriage between two friends, who cannot love each other, but can respect and trust each other. Cause both of them aren't really pursuing love. One is pursuing her future and one is his justice. So from that I can take a marriage. That can be built further.