The "war" on gentrification has in my experience been one of the most passive and apathetic wars, and like the article says, its mostly the first wave of gentrifiers that complain about it. In university, the local anti-gentrification movement formed food co-ops and local community groups, and hung out in tiny coffee shops with local art on the walls. I always felt like their passive, unknowing contribution to attracting further gentrification was greater than any resistance to it.