The UW rock is a Seattle icon, and should be rallied around by all PNW climbers, as nearly all of us have climbed there.
If they want to build an overpass where the rock is, prehaps they can just build a new wall under the freeway ala burnside skate park in Portland or the mtn bike trails in Seattle.
The atmosphere would be compromised, but at least the new structure would be dry 24/7 year round.