I've only been to Arches National Park once, but it was a great trip and I plan on going back again. I heard that a few days ago Wall Arch, which is located on the Devils Garden trail, collapsed. I don't know if it's morbid or what, but as I see arches, I often wonder how long they'll stay up like that and if I would live to see them collapse. I wasn't hoping I'd see them collapse, I just wondered if it would happen. Sure enough it has.
I'm so surprised Landscape arch has made it as long as it has.
Here is the official press release for the collapse of Wall arch:
Wall arch collapses