If your WiFi actually works (unlike at my office where it sucks and often is home grown supported) there isn't any reason for people to be stuck in one place. We had open office where I had like 10 sq feet of space, then moved to a cube farm (7x8 ft) which was much better. But I like the idea of random areas with lots of good places to sit and a mix of quiet/collaborative as needed. But if you had both offices and open seating, how many people would like which one?