The Tesla Blitherings? I keep forgetting it's there. A bunch of things happened in my life in late 2016 and 2017 that derailed a lot of hobby projects.
You should ask them how they manage living with an obsolete car (ICE).
But more seriously, if Tesla was to fail at this point somebody would buy the assets and keep producing the cars. And somebody would step in and do something to keep the older fleet on the road. Supercharging might go away and life would generally be more difficult, but the fleet would still be operational. There already is a number of people restoring wrecks and keeping them going outside of the Tesla network.
Look at what happened to DeLorean. Their production numbers were a tiny fraction of the numbers Tesla has produced and there has been quite a community keeping them on the road. There is a company in Texas that is assembling a few new ones now.
I would try reaching out to Rich Rebuilds
Contact – Rich Rebuilds
He started his journey with Tesla here on this forum posting about his experiences restoring a Tesla that had been in a flood. He put it back on the road. He's in the process of starting a Tesla repair shop, but he's in Massachusetts. But I've heard he's pretty good at giving pointers to people who are trying to figure things out. Considering how many Teslas are in California, there may be someone like him, just less well known doing the same thing there.