I'm all for unextincting various things. But mostly big things... no bugs, or things that can easily escape. Big, fuckoff wooly mammoths? Sure! Do it!
Because, in the process, we are going to learn a lot about biological processes we don't have a grasp on today. Heck, even the reproductive systems of elephants have barely been analyzed!
And, if the chance-in-a-billion happens and a wooly mammoth walks the Earth again... then science is going to have to finally come face to face with the harsh and icky reality of psychology. So much science operates in the biomechanical realm, and shies away from the psychological impacts of what it does.
But when the baby mammoth dies of depression because it hasn't got a momma, science can no longer shirk the responsibility it has for the mental well-being of its subjects.
And I suspect that timeline will coincide nicely with the one where the first glimmers of true AI come to light/life... and the geeks will be beset on all sides by squishy icky gooey feelings.
That collision needs to happen sooner rather than later. So I hope they make a mammoth soon.