Iowa is coming around to letting underutilized roads return to gravel as a cost savings measure [1]; expect other government bodies to follow suit.
[1] https://www.strongtowns.org/journal/2015/7/6/iowa-dot-chief-...
EDIT 2: If you've already gotten this far in my comment, do take the 2-3 minutes reading the above citation/link; its eye-opening.