Unlike other car manufacturers who go bust (like Saab 7 years ago), Tesla has worked hard to limit third-parties from repairing their cars. So if they go bust, you have to hope that their service business gets spun out into a company that lives on, and that this company (which retains a monopoly) doesn't charge you ridiculous rates.

Unless I'm mistaken a major component of the Tesla value prop is the supercharger network.

I presume "shit hits the fan" includes goodbye supercharger network.

Furthermore, unless I'm again mistaken, a bunch of people are under the impression that they'll have unlimited free supercharger access for the life of the car.

I'm fairly sure cars have a required minimal / expected lifetime (especially in the EU), but I wouldn't be surprised if that's well earlier than the expected lifetime of their batteries. So far so good, I haven't heard any news about battery failure or used Tesla cars being worthless due to needing a battery replacement. Mind you that is likely to happen sooner rather than later, it's been nearly 10 years since the first Model S models appeared.

Just like with SaaS, when things go boom, you’re screwed.

With Tesla, i would assume that in car features like autopilot would go poof, along with the proprietary chargers and spare part availability. Also, who knows what over the air maintenance is happening.

With a lease, your liability is capped to the lease payments. With ownership, you can ride it down to zero.