I think that this, like most things having to do with CARB and the EPA, is about money. I'm sure that many body shops (especially those whose primary business is insurance work) would openly embrace this type of enforcement. Anyone who needed any type of minor paint work would be forced to pay a shop to do the work. It would really suck if you, a non-certified individual, could not buy your own paint/paint-related products. *sigh*
I'm glad, atleast, that the implementation date is targeted for '07. A couple more months and I will have my car painted.