I’d have no interest in owning a second home anywhere as a vacation home. I could see owning a rental home with one apartment left vacant. But a truly empty building has too many things to go wrong with it. Basically all the disadvantages of a timeshare, but more expensive.
Scrooglemobiles? Practically, not a huge difference in energy use to manufacture them. Car lifespan is more limited by mileage driven than by years used. The cars would last fewer years while covering approximately the same mileage before replacement. If anything miles might be marginally increased, since during less busy times, they might need to drive a while seeking their next fare.
But I think that privacy is also important. Till there’s a law requiring full data deletion at the request of a customer, I can’t support “things as a service” replacing an in-house or cash economy. Penalty for failing to delete user data at request should mean 10 lashes with a rotan for each instance. Applied to the CEO’s bare arse. Televised.