My instinct is to see it as a federal land grab. But I’ve never been there.
I have. It is basically the two muntain ridges in the picture below, nothing more. It is surrounded by the Southern Ute reservation, (and the land was actually taken from the reservation, I'm sure the Utes were surprised), and federal land like national forests. There is absolutely no threat to the archeological sites that this new designation will affect.
There are some nice Anasazi kivas and artifacts there, and it is an interesting historical settlement with an interesting story. But it is already protected federal land. This is yet another case of the federal government passing a law to protect land from... the federal government, and to have you groveling at their feet in gratitude. Basically the same as when Clinton created the Escalante-Grand Staircase national monument out of already federal wilderness land.
Beautiful area and early man sites. This is probably a good idea.