If Utah can do a 4 day week, why can't everybody!

Utah, perhaps one of the most Republican districts in the US, just announced that they are moving from a 5 day week to a 4 day week.

http://www.usatoday.com/news/nation/2008-06-30-four-day_N.htm

It seems like a no brainer, our society cannot afford to spend 5 days a week in traffic.

One less day of mandatory commuting could save the average driver nearly 20% and would allow governments and businesses to have equal savings in reduced energy demand from having offices heated or air conditioned.

Less energy usage. More time for families and leisures. Why not?