I like Stewart's proposal for two reasons. First, it goes through a reasonable process with input from various affected parties before it becomes a reality. Any decisions are more likely to be based on facts and reason than political whims. Second, it is a more permanent designation than the back-and-forth effect that comes from different administrations' use of the Antiquities Act. Shame on the Clinton and Obama administrations for starting us down this politically-based path that is based solely on one administration that happens to be in power at a given time.
From what I've seen once you have a National Park the land is over powered by all the people. One of the fortunate things about being old is that I have enjoyed many of the Wests parks before the shuttle busses, rules, and the shoulder to shoulder people. You want to take away the experience of a beautiful place? Make it a national park.