Sony is not interested in a business of supporting the backbone of broadband. Optical fiber is already a commodity because it is not limited like radio wave. Sony is, however, interested in having a say in the industry. For example, competition between IP carriers and telephone companies will become stronger in the future. This is why Sony decided to invest in Crosswave Communications.
Japan leads all the other countries in terms of optical fiber network.
In this respect, Japan could become the advanced nation in high-speed network. The only problem is that the regulations are closed but the situation will definitely change. But I think NTT too wants the situation to change. The day that the bandwidth of networks to the home will become unlimited will come sooner than everyone thinks. I would say within five years.