Large (family-sized) houses, cheap houses, and reasonable commute times. You can have any two, but not all three.
In the post-war period the predominant change in urban form in American and other New World cities was for the inner cities to empty out in favour of the suburbs. Now that the inner city has come back into vogue, the greater demand for land and housing - a shift in the underlying ‘fundamentals’ of the market - has put ‘family-sized’ housing in the inner city under real price pressure.
Part of the solution is in improved mass transit links, especially rail, as this reduces commute time over driving and makes it feasible for people with families to still live some distance from their work and still get there in a reasonable time. This is how British cities of any size work, leaving the inner city with something of a skewed demographic (more single adults and fewer children) - and quite evident in the churches, as well, as any look at Redeemer in NYC will make clear.