It has to start somewhere.
There are already great moves in my region for people to have much greater flexibility in their hours of work, and, where appropriate, to work from home. If you've got young kids that last thing you want to do is to take them at a very early hour to school and then battle through traffic to get to work for 9am, and then to do the same in reverse at 5pm.
The Net is a game changer and has brought us all the opportunity to work away from the traditional desk. Of course, it's not for all, and some people don't have the discipline to work from home. Also, working from home can be quite lonely and has its own challenges. Interacting with other human beings can be missed greatly by some.
The challenge for Japan is that changing the culture of a work week will be much tougher.
Perception: Is it a four-day working week, or a three-day weekend!