Restart, yeah. But I'd imagine that a car left unused for decades would require quite a lot of servicing before returning to the roads. Namely, there are many rubber parts, seals and so on.
It might run, but you really shouldn't.
It might run, but you really shouldn't.
IMO, there are two things Tesla could do, one is an automated notification when your battery runs low, presenting you the options to a) let it just sit, b) turn off all electronics to preserve a little more battery and c) to let a Tesla service guy come to save your battery.
The other thing is, that you should be able to enter tow mode just from an external power supply, so it will be trivial to pull it out of your garage.