https://www.popularmechanics.com/science/animals/a42708517/scientists-reincarnating-woolly-mammoth/

Edit: I should say, not as old, but still. Also, we don't take care of our elephants, wtf are we going to do with a woolly mammoth.

Even if we could get a perfect DNA genome of a dinosaur, how would we go about getting the biological machinery that would've converted those blueprints into a living organism?

We can modify the genes of living animals by creating viable zygotes, growing them into viable embryos, and implanting them into living wombs, because we already have a factory that is configured to process blueprints of a very similar type.

We don't have the ability to rebuild a dinosaur factory, even if we get the dinosaur blueprints again.

Anything that accelerates the downfall of humankind is good in my book.