Goodbye 100 Watt Bulbs

The energy bill just passed bans sale of 100W bulbs in 2012. Assuming this is a good idea, why wait?
Is it a good idea? They say that these bulbs save energy, and thereby reduce carbon emissions. Maybe.
If you use a bulb in the winter, the heat produced helps keep your house warm. If your house is heated with oil or gas, things get complicated. If you use fewer watts of electricity, you will have to use more oil to keep the house warm. So far, you might assume we are still equal overall, but in my state 38% of electricity is made by nuclear power, with no carbon emissions. So in the winter, with oil heat, you may be doing the environment a favor by using incandescent lights (if they are used indoors. Outdoor Christmas light displays waste power.)
But...
In the summer, the situation is opposite. If you air conditioner has an EER of 8, it takes 40 Watts of power to remove the heat made by a 100 Watt bulb.
There is also the question of how much of your electricity is made by carbon burning, and how much power is lost in transmission.
It is not as simple as it looks.
Other important things could be done. Set national standards for building codes that mandate a certain level of insulation.