Do you think it could have been possible for this outcome to occur if the Mean 3 won?

[Jerry246 44]

This involves them carrying out Chrysalis's plan to destroy Equestria using the windigoes.

The possibility here being that the LoD's actions in destroying Equestria leading to the destruction of the entire world as well.  Their victory being Phyrric because they robbed the very ability for the world to sustain life with Friendship and Harmony destroyed. The Windigoes plunging the entire world into an eternal winter than renders the planet incapable of sustaining life and essentially wiping out all life as a result. The Mean 3 being the only ones left alive in a dead frozen world. The end result of their shortsightedness caused by their petty revenge on the Mane 6. That and also the sun and moon plunging into the planet and destroying it and those three with it.

Edited September 5 by Jerry246