Everfree's magical properties suddenly overlay over the entirety of Equestria. Would your pony waifu be able to weather the catastrophy? Would she be on the front lines restoring order? Or would she wait out the storm in a shelter somewhere?
>>30947214
With the weather becoming untameable, I'm sure that the rainbow factory would hit critical and explode in a matter of moments. Because the cloud structure would collapse into itself. The same could be said of all cloud-based facilities and domiciles. So Pega's would be forced to live on the ground, in the mountains.
Depending on your view of personal views on Earth Ponies, you're looking at a heavy nerf or near complete nerf. Being unable to do Earth pony 'magic' on crops and whatever, they'd have to make do the normal way and hope for the best. They might even only be able to do manual labor after that.
Unicorns would be the best off, hands down, with nothing really changing.
Pegasai would get the worst of it, with their whole world and way of life potentially shattered. Earth Ponies getting a nerf of some degree but their way of life generally unchanged or near scott-free Unicorns.
Now then, if that's the extent of it, then thats that. Now if that included a rise in Monster Population, things would get dicy.