Perhaps it's time for fuel injected portable generators. Fuel injection transforms the performance and emissions output of any engine, but small engine manufacturers simply won't bother, because nobody is pressuring them to do so, and they won't spare the couple bucks needed to make the changeover.
Until now, CARB emissions standards still accommodate both 2-stroke (insane) and carburetted engines. As goes CA, so goes the rest of the country -- once the manufacturers are pressured to produce the products by CARB, many of the other states will follow. This makes the economies of scale for fuel injection bring prices in line with current carburetted products.
A proposed ruling isn't a ruling...it's a trial balloon. You can bet that every manufacturer, from Honda to Generac to Kohler to Harbor Freight, will lobby hard for a reasonable accommodation...as will ranchers, the RV industry, the construction trades, and so on. The final ruling will very likely require MUCH lower emissions from these small engines (easily attainable), but the manufacturers absolutely MUST step up and bring to market what is now very old technology, EFI instead of carbs. Having failed to do so is absolutely unjustified.
PS. I have a brand new Generac 3000 watt inverter generator, and it stinks like ****...perhaps because it doesn't have a high altitude kit in the carb. EFI doesn't need a "kit"!! It just works. Given currently available technology, the idea that each end user needs to modify the carb to make their engine match the altitude is ludicrous. My 1978 VW had fuel injection for gods' sake, yet my '86 Accord was still carburetted. Honda...one of the biggest names in outdoor motorsports and equipment...is no angel when it comes to making the best choices for the environment -- despite the premium they charge. I have a 1999 Honda Foreman ATV I use to plow. It's carburetted. Ridiculous.
If you want to defend your right to buy a new generator in CA, weigh in. Personally, I'm all for making sure that a 200 CC engine is not putting out more emissions than a 5.7 liter V8.