Tesla might be "the F-35 of personal autos", but it kind of makes sense for have the AI part of a product be SaaS. The company invested a ton in R&D, and it's also liable for the damages (including deaths!) that the feature might produce if it malfunctions (hence they'd want it disabled after N years period where supporting it is no longer cost effective - even the fact that a city's roads configuration drastically changes 10 years in the future independent of the car could make the self-driving system unsafe, it's a systems issue here, no longer and "isolated product"!).

We're probably going to start seeing this more and more with "truly smart" devices... Though we do need ways to re-sell software licenses for firmware and stuff while they are still supported, even if separately from the actual hardware.