Earlier quoted context omitted.
Because cost are going up across the board throughout the Bay Area, and the transportation infrastructure - both automotive and otherwise - hasn't kept up. Moving further means increased commuting cost. For drivers this comes in the form of massively increased fuel costs. For transit users this comes in the form of increased fares, since BART practices distance-based pricing. Commuting daily from Fremont to SF costs…
I don't think they mean move to a place more affordable out side of SF, but move away from SF to another part of the country.
There's no way to win, except maybe temporarily exploiting an arbitrage opportunity (i.e., a place with jobs but the cost of living hasn't caught up yet). Expecting people to do this is unreliable at an individual level, and disastrous as public policy.
Ultimately the only mid- to long-term solution is to help make job centers cheaper to live in.