I think coming together in physical space is always going to be important. What I can imagine going away is the one office, one firm model. I think architecture and other firms can benefit from multiple firms sharing office space with other companies from different industries.

Check out CoCo - http://cocomsp.com/ (coworking and collaborative space in Minneapolis and St. Paul) and Officeport - http://officeportnetwork.com/ in KC and Chicago for examples of this in action.