One of the fundamental issues is that there has been a change in the way that the housing provided by the military—when it is provided—is regarded as a taxable benefit under Treasury Board rules. Previously, the CAF was able to provide subsidized housing with a subsidy, but that was deemed a taxable benefit, which meant that CAF housing had to be offered at market rates. You can imagine, as with any institutional landlord, that it's very hard to maintain your housing stock at market rates such that families want to live in them.
The other change has been in people's expectations around what family living looks like. I live in a house that was built in the early 1970s, as some CAF PMQs were. It's considered quaintly small by most of my friends who live further out of town in larger, more modern houses. Part of what's happening is an economic thing around taxation, and part of it is around people's expectations around what housing looks like.