More offices?

I heard on the radio, that they think that we will need 50% more office space by 2015. Personally I don't think so. I mean, more and more people are spending their day in front of a PC so going into an office to do that are becoming more and more pointless as technology is enabling us to connect and communicate remotely from our own bedroom! Why would we want to waste even more time in trafic/trains/etc when we can do our job perfectly from our own home?