I doubt you’ll be able to buy a personal level 4 anytime soon, it doesn’t make sense to use them as anything but fleet/taxi vehicles since they can just come to you whenever needed.
Buying a L4 car may be not possible. Because I don't even think they will start selling them initially. May be we can bet on number of L4 cars in operation after 5 years.
Any likelihood of this vehicles being at times(say on the highway) autonomous and at times remotely driven ? Does this work technically , and maybe legally ?
Similar background and profession - putting aside whether an individual would ever want to own one, general purpose passenger autonomy won't happen for probably another decade. Limited domain autonomy will be here in before 5 years, though. It'll just suck.
But the first step to getting good at something is sucking at it.