I'm assuming both you and your spouse are earning money, in my numbers. Additionally, you would presumably make investments with the money that you're saving, so you don't quite have to save the whole $1.5m straight up. I'm also not sure why you used a 2% withdrawal rate -- typically 4 to 5% is regarded as a conservative rate, which would be $60k to $75k per year.

I'm not suggesting that doing this is a walk in the park, you definitely have to prioritize around it (which may include living in a city that isn't insanely expensive), but it's doable.