This also assumes that widespread adoption can be influenced by mandates. California may have mandated an end to gas powered cars, but I see it being very difficult to impose that on the entire country. And as of right now, there are always serious doubts about how successful the future of EV will be in a state like California when the power grid is already not robust enough to handle it. If I were in California, I would probably just buy a gas powered car outside of the state to get around all of the problems that come with the technology.
What you're overlooking is how the industry is responding to the mandate, which is positively. One in eight vehicles sold in the United States is sold in California. It's why California emissions standards (after a period of building "49-state" cars and "California emissions" cars) became what manufacturers built to.
Also, on October 28, the European Union announced it's going forward with a mandate that mirrors California. Same basic parameters---no new internal combustion passenger vehicles sold after 2035, with a carve-out for plug-in hybrids with 50 miles or more of pure electric range.
Last year, with sales constrained by supply-chain issues, 10-million new passenger cars were sold in the EU.
With those numbers, it's unlikely that manufacturers would continue production of very many ICE vehicles even if California were the lone state with a 2035 cutoff, and it's unlikely that will be the case. In fact, 17 other states are weighing adopting the California standard at this moment, with only two of those (Pennsylvania and Colorado) considered probable "no" votes.
17 states weigh adopting California's electric car mandate
There really is no manufacturer resistance to speak of. Many, in fact, will beat the deadline and won't have gasoline or diesel-powered passenger vehicles in production well before 2035:
Every Automaker’s EV Plans Through 2035 And Beyond
As for the power grid, it's worth noting that 80 percent of all EV charging happens at home, 30 to 40% of those home charging units are powered by solar, and publicly-owned utilities are not part of the grid that's in trouble (which is largely PG&E's). That includes the Los Angeles Department of Water & Power and the Sacramento Metropolitan Utilities District (SMUD):
MAP: California Communities That Supply Their Own Power | KQED
And, the thing everyone forgets---
they don't all charge at once. Most EVs now provide upwards of 250 miles on a charge, matching or exceeding the range available on a full tank of gas. Most people don't go to the gas station and fill their tank every day.
But---with an EV, you can plug in and keep your vehicle continually topped off every night. It's a small amount of electricity if you've just driven 40 miles, but IF there's a massive blackout, you've got the electric equivalent of a full tank. And, in a blackout, gas pumps don't work, so you're actually a bit ahead of your neighbor.
Having now driven two dozen different EVs for a week each as part of my work as an automotive journalist, and not having charging beyond a 110V extension cable in my garage, I can tell you the weak link at the moment is public charging, which is essential not only for road trips but for people living in multi-unit dwellings.
There aren't enough of them, and incidences of rolling up to one to find it out of service are way too common. But there's a lot of action on that front. Here's a link to a Google search of the most recent news:
public ev charging stations
And finally, we're talking about 12 years, not a week from Thursday. It's worth remembering that 12 years ago there were exactly ZERO electric vehicles on the market, and ZERO public charging stations (unless they were leftovers from the GM EV-1 experiement in the 1990s). Today, there are 34 EVs for sale in the US:
Guide to Every EV for Sale in U.S.
...and 144,000 public charging stations:
Interactive: EV Charging Stations Across the U.S. Mapped
All of that has happened since the Tesla Model S went on sale 10 and a half years ago. We have that much time, plus a year and a half, to build out the infrastructure.
In the meantime, you can buy whatever you want, and after 2035, if you still don't like it, you can buy used (three times as many used cars are sold every year as new).