why Johnny and jane must leave home

Forget the raw materials and the tax incentives and the interstates, the 21st century's growth areas are those which appeal to talented people. This means:

High counts of gays and counterculture "Bohemians"? Lots of immigrants? Downtowns with lively music and arts scenes, even a tolerance for tattoo parlors?

Yup.
In general, strong high-tech growth has erupted in cities that not only tolerate, but seem to promote and indeed celebrate all manner of cultural diversity. Cities that ignore the new signal will likely be stragglers in the new century's economic race.

We know where Johnny and Jane want to be, even if their names are Ivan and Janisha.