If you bought it recently, you'll probably be massively underwater (and, since your plan isn't just a one-time cut to let people on the ride, but also attacking the dynamics driving value increases) permanently so, and fucked if you ever need to move, or to get other credit.
If you are close to selling and downsizing, and its your main asset as it almost invariably is, your life savings was just deliberately cut in half.
> Housing should not be an investment.
Maybe in some idealized vision; in the real world that exists right now it is, and its heavily relied on by the middle to top, by income, end of the proletariat and maybe the bottom end of the petit bourgeoisie, which as targets for class warfare go is a pretty odd choice. And trying to attack this (regardless of arguable steady-state merits) while handwaving the transition issues is simply that—class warfare against that group.