Fictitious Scenario: Although the Dry River Bridge was convenient, once it is removed, hikers can still access the eastern side of the Dry River Wilderness from Route 302 via the Davis Path or the Mt. Langdon Trail. And, hikers can access the western side of the Dry River Wilderness via a variety of trails (Mt. Eisenhower Trail, etc). Furthermore, there are two access points where (at low water) hikers can cross to the other side of the Dry River (via either the Mt. Clinton or the Mt. Eisenhower Trail)!
I think this is a very good point - technically, you can access plenty of bridged areas via significantly longer technical routes if they were to remove those bridges.
I still would like to see a financial analysis - how much it will cost to remove (using wilderness tools and techniques) vs. repair. I suspect it could be cheaper to repair. I know that if I presented a similar scenario where I've worked (private sector), I'd be shot down in a second without providing financials to back it up.