Seth Godin gives the last rites:
If we were starting this whole office thing today, it's inconceivable we'd pay the rent/time/commuting cost to get what we get. I think in ten years the TV show 'the Office' will be seen as a quaint antique.
When you need to have a meeting, have a meeting. When you need to collaborate, collaborate. The rest of the time, do the work, wherever you like.The gain in speed, productivity and happiness is massive.