“inevitable”? hardly. how many first-year Leafs are out there on the original battery? a lot, i’d reckon most. how many dead Leafs are out there which were totalled because of needing a new battery? certainly less than those which were totalled due to rust, collision, etc., ie the things that kill gas cars too.
Is it obvious? Waymo has hundreds of driverless taxis in SF where you literally cannot sit in the driver's seat. Stuff that consumers can currently get their hands on isn't really driverless but the tech exists now.
This has been possible for years. I actually got in the habit of porting my qt projects to the web target because they ran better than native compiled on some of my older machines.
shutting down means you cannot receive phone calls.
This is actually one of the major problems linux phone operating system hackers have been trying to solve — idle power consumption is really really important for a cell phone, but most hardware open enough to run custom operating systems on don’t have easy ways to suspend to a reliable low-power state.
Free as in free speech, not as in free beer. This has been a slogan of free software for decades. Charging money for your software is not in any way incompatible with open source.