A lot of people seem to think we can only accomplish a transition away from fossil fuels after alternatives for fossil fuel driven appliances are available, fully scaled up, and cheap. That won’t happen without demand.
Given that nobody cares about their furnace as long as it works, and that in the Bay Area these decisions are made by landlords about every 20 years, who are just trying to get the job done as fast as possible at the lowest price, just banning the gas burning version is a great way to create the necessary demand to accomplish this transition on schedule.*
*”on schedule” here means “in enough time to mitigate climate change enough to prevent the release of exotic diseases from permafrost”