This is just a step or two away from getting completely out of control (as if they aren't alreasy). Imagine what will happen when the government decides that the apartment complexes that accept section 8 vouchers are either too few or not in nice enough neighborhoods. Whats stopping them from forcing the sale of newer apartment buidings near well priced single family homes to companies that WILL play the governments game. The possibilities for abuse are almost endless.
Already happened here in Alabama. The City of Montgomery decided that the Section 8 Housing projects were located in such poor areas that it was depressing to the inhabitants. So they bought a huge parcel of land SOutheast of the city and proceded to pop up the ever loved Section 8 cookie cutter duplexes _-- right next to a brand new high end subdivision.
Houses that were originally built in that subdivision for $150,000-200,000 are now being sold for $70,000-80,000, and almost half the houses stand empty with For Sale signs in the yards.