The truth is that most Americans have little interaction with the big-money, small-jobs technology boom, so they might be sheltered from the worst of the technology bust, at least as it looks today, if not years from now. But that might be cold comfort: It is a sad state of affairs if one of the most vibrant, explosive and creative parts of the economy — and one of the few that is minting millionaires — seems more like a walled garden than a public park.