A big leap from sequencing a genome and cloning an entire organism, without even trying to consider large numbers of them.
There would be massive problems in trying to recover a species from limited individual DNA samples (if they even have more than one viable sample).
If you're just cloning what would effectively be twins for the sake of a theme park, as in the films, completely unethical. Also, if a species has become extinct through natural processes, rather than anthropogenic causes, I'm not sure I'd support the reintroduction of a species, as it would be another step in screwing up existing ecosystems.