The theory is a sound theory. I believe that is truly possible that this is how life propagated on earth. However, that doesn't mean it's "true" how can a theory be true? If it was proven true then it wouldn't be called a theory. The main thing I'm waiting on is the discovery of a lot of missing links. I know we have unearthed the bones and remains of a lot of semi human creatures. Why aren't there any alive today? Chimpanzees exist, apes exist, why don't we see anything alive today that is in between chimps and humans? Humankind has so far never witnessed the creation of a new species as a result of evolution. Since we only live to be around 80 years old we might not develop that perspective.