I think there is some great climbing there. Regardless of what you think about the rock in Arches, this is the part of the letter that I think we should be very concerned about:
Arches National Park is grouped with 3 other Parks in its
administration. Many of the rules that govern one Park eventually fall
into the rule book for the one next door. In this case, Canyonlands,
an area containing more Windgate and Cutler towers than the rest of
the world combined, is next door. A draconian rule in Arches could
eventually lead to one in Canyonlands. If that's the case, it would
look like a precedent for other Parks in the country to follow. The
trickle-down effect could be seen with the BLM and Forest Service. In
other words, we could lose a lot more climbing resources than the
76,000 acre's and 100's of towers that is Arches.