So, there's this story called "Clipped Wings".
It's about Rainbow Dash losing the ability to fly and how she learns to live without it.
It's not finished as of now. But I think It has the potential to be a great story.
I mean, who wouldn't want to read a story of how the fastest flier in Equestria lives with being grounded?
Anyways, you gotta check it out. Here's the link: