Uber, electric vehicles, and Google maps are steadily revolutionising transport in this and other countries. The convenience they offer is already causing many young people in cities to question the need to buy their own car. Once you have bought a car, you are very reluctant to do without it. The change is happening with young people, who increasingly are doing without a car, particularly in cities where public transport (and I include Uber as public transport) is increasingly convenient.
As petrol usage drops, so the support costs will rise. Petrol stations already run on very thin margins - as fewer and fewer people use less and less petrol, so the number of petrol stations will drop. It will become increasingly inconvenient to refuel, and with less competition, and less sales paying for all the supply infrastructure, petrol prices will surely rise. And as petrol becomes more expensive and more difficult to obtain, so fewer and fewer people will use it, in an ever decreasing spiral. The change will happen quickest in the cities, but will inevitably spread outwards.
I saw somewhere recently two photos taken in central London. In one photo, the street was gridlocked with horse traffic. In the second photo, the same street was full of motorised vehicles, with only one horse-drawn vehicle left. The astounding thing was that the two photos were taken only ten years apart, 1909 and 1919. I suspect that if you had suggested to one of those carters in 1909 that horse traffic would be all but gone in 10 years time, I suspect he would have scoffed. I think that we are on the verge of the same kind of transformation now, both in the move away from petrol, but also in the move away from personal car use.
The bus network is only going to survive if buses can offer something better than Uber. As a previous poster has pointed out, people now travel home from night events by Uber rather than night bus, because Uber is far more convenient. OK, it might be more expensive, but people will pay the extra for a one-off event. For rush-hour travel, Uber is never going to have the capacity to compete with the buses, and most people are unlikely to pay the extra on a regular basis. So while the peak-hour traffic is likely to survive,, the number of one-off off-peak journeys by bus will likely take a big hit. Which will mean the buses will inevitably need more subsidy if you want to keep the peak-hour services, even if you leave them all sitting in a garage for the rest of the day.
Uber is likely to be good for long-distance rail travel (or lead to even more overcrowding, depending on your point of view). As more people rely on Uber for short-distance travel, and so do without a car, so they are more likely to use rail for long-distance journeys, using Uber to get them to the station.
Integrated journey planners, like Google maps, are also helping these trends. In the past, people who used the bus to get to work would also tend to use the bus for other journeys, as they were familiar with the bus network, and getting information about other modes could be a right phaff. Now, they can use Google maps to plan their journey, and it will point out the rail and Uber alternatives that may be much more convenient.
The inevitable introduction of driverless vehicles in the future is going to significantly reduce the cost of Uber and suchlike, making personal car ownership less and less attractive. Again, as fewer and fewer people own their own car, so the costs for the fewer and fewer who do want their own vehicle will inevitably rise. Again, the number of private vehicles went through the roof in little more than a decade, who is to say it won't drop back again in the same kind of timescale.