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There is no good scientific reason to bring back an extinct species. Why would one bring them back? To put them in a theme park?

Nature favors those organisms which leave the environment in better shape for their progeny to survive.

Species go extinct because there are historical contraints built into a given body or a given design.

Nature conserves, prefers novelty.

With the advent of genetic engineering the time required for the evolution of new species may literally collapse.

Most evolving lineages, human or otherwise, when threatened with extinction, don't do anything special to avoid it.

Through the evolutionary process, those who are able to engage in social cooperation of various sorts do better in survival and reproduction.

There are so many ways to characterize evolutionary success. If one criterion is the number of millions of years that the species persists, we're still just infants. We're way too young of a species to tell if we were a creative fluke or if we have any staying power.

Living in an entirely different physical as well as biotic environment, such a population would have unique opportunities to enter new niches and to select novel adaptive pathways.

I think future engineered species could be the source of food, hopefully a source of energy, environmental remediation and perhaps replacing the petrochemical industry.