I've been thinking about this, and if CHMC is privatized (perhaps even sold to MIC), then they would be at less of a competitive disadvantage to CMHC itself. One possibility is that the Finance Minister may keep the 90% guarantee for companies like Genworth but get rid of the 100% guarantee for CMHC.
Something to keep in mind for anyone who's shoring MIC.TO as a way to arbitrage against a fall in housing prices.