Lillyanne's Favorite

Guys, GUYS! I know what the significance about the pigs was! Ymir let them out, not to be malicious or anything, but because she wanted to give them their freedom. A thing that she could not attain for herself in her circumstances.
Now Eren has taken all the steps to free her too. He's opened the way for her to get out of that dimension which has been her prison for the past 2000 years, forced to build titans when it was called for. Together they want to give her people their freedom from the rest of the world that hates them, so they are destroying all enemies to make it possible. In that regard I believe they are working together.
Here's the thing though, which worries me. Ymir currently has no soul, right? It was divided into nine pieces, and now for the first time in the entire manga, all nine pieces are together in the same place as well as she is out of her prison. My theory is that Ymir is going to get her soul back and be reborn as Historia's baby into a world where she will be loved and free this time. What I don't know is if that means death for all our beloved titan shifters, or if it will make them human again. The titans seem to be separate entities from the people who hold them, so maybe they would only be taken away without any harm being done.
Also, couldn't the coordinate be used to remove the titan power from all Eldians and banish it from the world? Return that power back to wherever it originated and just be human.
Anyway, those are my theories. I'm sure I will discover in a few months if I was even mildly correct or not. Thoughts?