Nah, I doubt this will have any lasting presence.
And why would she get with someone she doesn’t even like? She even explicitly stated she didn’t like him.
I think they did this specifically because it's almost over. They needed a reason for him to quickly look past the "I've got a small and cute senpai" and see "I'm in love with my small and cute senpai" with all the urgency of a series that's about to end... It really could have been anything to give the push...