The problem with #2 is that a depressively expensive 1BR condo ceases to be a practical option once you have children.
Or be happy with a life without children as a lot of us are.
So, this brings me back to the original predicament: when you get to nesting age (which normally runs concurrent, or closely precedes Having Kids Time), you're gonna start looking at your finances and looking at the local real estate market and many will need to make some very tough decisions - decisions that I, personally, don't see including San Francisco.
It sounds like you're brought up with a more traditional expectation of constitutes a house - 2.3 kids, picket fence, et. all. That's depressing.