Wow… That actually makes sense.

I mean answer this with something that is not along the lines of “it’s a cartoon show”, “who cares?” or “you’re overanalyzing”
 
FIRST: the equestrian and crystal ponies are separated by god knows how many thousands of miles and a big mountain range (as seen in the official map of equestria), how can they be pretty much the same in terms of species and being so far from each other? only if at one time they were the same people.
 
SECOND: isn’t it a coincidence that the original pony homeland was frozen tundra (as seen in the heart’s warming eve episode), which is the same for the crystal empire? only if both lands are one and the same.
 
THIRD: isn’t logic that when the great emigration occurred, many ponies could have refused to emigrate, that they chose to stay and make the most of their homeland, or simply because they didn’t want to? it happened IRL in antiquity why not here?
 
FOURTH: does anyone has any other plausible explanation of how the hell did the crystal ponies came to be?

DAMN YOU!
 
Now I have something more to be HeadCanon’d.

Interesting…

I like this conspiracy.

I sort of figured something along the lines of this.

@ CottanTales.
 
Send them back where they came from. They were free sentient lifeforms now they are water trapped in a pond.

@Alis  
why does everyone say the pinkies’ died Twilight explained what the spell did

They solved the racial problem when everypony who had wings or horns left.
 
God I love what this show gets in under the Radar. Shape Shifting love hungry bug ponies, genocide of a new race of Pinkies, Zebra’s (black woman) being accused of witchcraft and cannibalism, Celestia’s stone corpse garden, Earth Pony Slavery to Unicorns and Pegasii in in the past.
 
Now this.
 
I <3 MLP

@BP: maybe they thought at the time that the crystal heart was a better option, I don’t know.
 
Anyway, I think this theory is plausible, is similar to the history of England, the saxons, angles and jutes who emigrated into Britannia eventually founded the kingdom of England. those who stayed in mainland Europe formed their own nations.

makes enough sense

Yeah, something like that

There had to have been more than one original homeland, since the three races didn’t live together

Interesting…  
Also the nature around them withered and died.

Actually, it sounds pretty legit.
 
Unlikely, but interesting.

If the windigos can be banished by love alone, why bother making the crystal heart?