What kid hasn’t imagined mammoths or saber toothed tigers, or Tasmanian tigers and dodo birds (I’m putting dinosaurs aside because they are tens of millions to hundreds of millions of years older)
But, while good for the imagination, where would we put them?
Their ecosystems don’t exist. If they did, people are encroaching on them...
So that leaves curiosities at the zoo (or special once extinct species travel destination).
Is that what we want?
And what about Neanderthals, do we bring them back? Being near human what are the ethics of that?
That leaves a safety valve for species going extinct. This would be a good use. But it can have the effect of people caring less (don’t worry, we can bring them back if we have to)
On the other hand... this and space travel....