A fully car-free solution for rural areas is less easy to achieve than in urban areas, and it's not something that is likely to happen in the near future. That said I think it's important to point out that a car free existence isn't impossible in rural areas, lots of people do it and many of them because they don't have any choice. Some rely heavily on help from others, some simply accept a restricted lifestyle, some position themselves in places which are rural but d have reasonably good public transport connections.
I think it's important not to view rural transport as something to be solved by a single technological solution. Even giving everyone access to shared autonomous vehicles doesn't remove some of the problems that are caused when everyone wants to go into the local town to do their shopping. You still end up with issues of parking and congestion and so on. I'm not sure that roofed/cabin two-wheelers get around all of the problems that cars create.
There might be some less radical technological game-changers, such as more availability of online ordering/delivery. I'm interested to see how that plays out in rural areas. Also, e-bikes and maybe even e-scooters have the potential to make things that were previously just out of reach for some people, become within reach. For some people. e-bikes are not a solution for everyone, before anyone starts saying I am demanding that OAPs go shopping on electric scooters.
Also important to bear in mind that there are many types of "rural" ranging from a kind of spread-out version of suburbia to truly remote places where there's not a shop nor any public transport for 30 miles. The right solutions will be very different in each case.
My immediate focus for rural areas rather than instantly getting rid of all cars would be a reduction in the vicious cycle of car dependancy and things that make life more equitable for those who aren't able to drive or can't afford to. In some places it makes sense to try and increase bus services and in some places you might have to accept that a bus service is not viable. Transport policy should be linked in with planning policy meaning that you try not to end up working out how to get people to distant out-of-town supermarkets and instead do everything you can to make things like shops viable in small settlements. Try and locate any new rural housing in places that can be served by public transport. There's also plenty of space to reduce the number of car journeys overall without demanding anyone give up access to a private car. There are things you can do which might allow a household to shift a proportion of their journeys to public transport and become a one car household instead of a two car household.
My
nationalising everyone's car scheme is to make a point about car dependancy and the way that marginal costs affect journey decisions once you are invested into one mode of transport.
Some day maybe I will try and start a thread specifically on rural transport issues where an attempt can be made to discuss these things seriously. I actually have a reading list of recent stuff on this that I am yet to catch up on. Ignore the people trying to tell you I know nothing beyond central London; I grew up in a rural area, which I'm still very much in touch with and I'm very well aware of what problems exist and how they differ to those in urban places (although there are also plenty of things in common). The first instance of me going on about car dependancy is to be found in the pages of a magazine published by a small school in the scottish highlands in the late 20th century.