Well, if it won’t cross genetically with anything living and other specimens aren’t recovered, it’s probable it won’t have enough genetic diversity to be viable as a natural species.
You mean like using Using sophisticated techniques, they extract the preserved blood... from the mosquito, and bingo: Dino DNA! And Using the complete DNA of Frog to fill in the holes and complete the code!?
But I suppose you are correct, I still worry about these types of things though, we are meddling in stuff we aren't suppose too, and besides............Life Finds a Way.