That's exactly the kind of feature I want from a game this gen.
I want to see open world games with ever growing forest.
I want to see open world where you could put a whole town to fire.
I want to see open world game where every character / enemy do not spawn from nowhere but came from a defined population that grows an evolves as you play.
This is what cloud computing can bring.
I really hope that Undeads Labs are working on a next zombie apocalypse game that use that kind of feature.