Net domestic outmigration has declined significantly in 2006-2007 compared to 2003-2006.
Note that that in the past 4 years, while we had net outmigration of about 115,000 people, the net population continued to increase due to births and foreign migration.
I would think that this would result in increased demand for affordable rentals. Low- to mid-range rental rates are not likely to recede under these demographic conditions.