Let’s keep in mind that Tesla invested in this truck to be the next F-150, which is the best-selling vehicle in the USA for the past multiple decades.
Even the hated Edsel is worth quite a bit today. Although it might be harder to keep a Cybertruck running for 50 years due to all the computerized components. Restorers will probably be relegated to rebuilding Cybertruck bodies with new components.
And all the well-documented reliability and quality issues.
Really no different than any classic car, really. GM isn't selling OEM parts for a '57 Chevy, for example. If you need replacement parts on those, nowadays, you're likely going to specialty manufacturers given there really aren't any "parts cars" around anymore.
Good book on the subject: https://www.sup.org/books/history/disaster-dearborn
Tesla’s corporate leadership would be much happier if the Cybertruck was selling 100,000 units a year and was not at all a collector’s item.