I think future engineered species could be the source of food, hopefully a source of energy, environmental remediation and perhaps replacing the petrochemical industry.
The Anthropocentic Age - the first age in which humankind is the dominant species on the planet - cuts both ways: it is up to us to destroy or save the planet. We certainly have the ability.
We find all kinds of species that have taken up a second chromosome or a third one from somewhere, adding thousands of new traits in a second to that species. So, people who think of evolution as just one gene changing at a time have missed much of biology.