I wonder if having a new (2016) Model S as one's only car is viable? I know Tesla provides loaners for when your car is in the shop, but what if you are awaiting parts and the car is undriveable until they arrive? Do you get a loaner then? Probably not. I have heard that there are sometimes substantial waits for parts, which suggests that Model S owners probably need a backup car available. Any thoughts? Anyone with a Tesla as their only vehicle? Thanks.