You’re setting up a straw man. There is a middle ground between ALL state ownership and what there is now.
http://bigthink.com/strange-maps/291-federal-lands-in-the-us
Does anyone think the Feds should own as much of the western states as they do?
In any case, protections could certainly be built into sales/divesting back to the states to accomplish specific goals around wildlife and usage
Finally, reigning in the BLM should be a primary goal of any Republican candidate. Trump gave a speech about that in another forum, but it doesn’t look to me like he internalized the message of that speech enough to draw the obvious connection to his answer here.