I do think building up is a pretty good idea. I just wish it all currently in the Boston area wasn't luxury condos. And the existence of those luxury condos hasn't seemed to deflate the demand on other housing yet. Maybe in time?
Luxury condos unfortunately don't produce long term jobs, so I'm not too sure what the plan is with the SF/NYC/LA/Boston/London/etc luxury condo building boom that's going on right now..
If I am to believe the self fulfilling prophecy of "the market cycle", it's just a game of hot potato.