I wouldn't worry at all about not being able to maintain it. Worst case scenario: they get acquired and VW/Apple/etc will service your car. The brand is too valuable to die at this point.
Just because the brand lives on doesn't mean the old tooling that makes the replacement parts didn't get sold to someone who will turn it into ball bearings during the liquidation and reorganization.
That said, considering how good Tesla isn't at supplying parts to their own shops (let alone the aftermarket) having Dorman (or whoever, but this would be a very Dorman thing to do) acquire all the body dies at some post-bankruptcy liquidation sale and start cranking them out from a factory in China could very well wind up being better for parts availability than the current situation.
If Tesla is acquired I would imagine it would be for IP; I could easily see the brand going away with the billions of debt.