Agreed. I can definitely see this as one of the most likely avenues for Ron and Kim to develop their relationship further as they go into college and beyond. That's if they stick together of course. I've met very few people who were high school sweethearts that had a stable and happy marriage afterwards.
Of course, none of those people were world-traveling heroes that stopped villains from taking over the world, so there's that. And we've seen how it goes from A Sitch in Time should they ever break up as a duo XD.