I got an email today from the NRA-ILA about this subject. S&W and Ruger did not refuse to keep their handguns on the roster, but they are being forced to let their handguns fall off due to changes made in their designs. So, they did not make a choice to stop selling their still legal handguns to CA, but they are no longer producing those guns.
That changes things for me, as I knew this would happen. I just thought it would take a while longer. The changes weren't stated, but I'm assuming that they were relatively minor things.
These changes prevent them from selling many of their semi automatic handguns (not all have been modified) to their CA customers, but Ruger's CEO, Mike Fifer, has personally claimed that he will do everything in his power to help CA overcome this ridiculous law.
Both companies have stated that they will not be adopting micro.stamping.
Despite my previous statement, I will continue to support them with my business...as much as I can from CA territory.