What a weird bill, it only affects a 4 month period, what is so special about Sept 27, 2010 to Jan 1, 2011?
One hypothesis might be that a more long-lasting bill is being drafted, and this an interim solution.
A more realistic hypothesis is that they've figured out that a long term approach is dumb. A bill that has to be renewed every six months gives folks two reasons a year to "help" the legislators.
Remember, "reform" means "we need to get more money from supporters".