zoning budgets- one way to keep NIMBYism under control

Roderick Hills and David Schleicher, two law professors, have proposed one way to limit NIMBY-inspired downzonings: a "zoning budget."  Specifically, they propose that cities require every downzoning to be matched by an upzoning somewhere else, so that the city's "budget" was always balanced.  (See http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1816368 for the article, or http://www.cato.org/pubs/regulation/regv34n3/regv34n3-6.pdf for a shorter version).