I live in Dallas, have a driving commute well under 25 minutes, and have a 3 bedroom, 2300 sqft house I paid $175k for with the same stipulation on the schools. Your scenario would be a major cost increase for me. In fact, I could probably max out my 401k here with just the housing cost delta. Austin is more expensive than Dallas, but I wouldn't expect to pay more than about $250k - $300k for my house there (for reference, my house is worth about $190k now). I could downsize to your SF-sized house here for under $100k. Since I would realistically only get about a 70% pay raise max over my Dallas salary for moving to SF, it doesn't make any sense.
 And my house was a good deal even for Dallas.