I would love to have that time when most public transportation are reliable just like in Japan and other rich countries. Because I can see that many countries are car eccentric and that's why public transportation is like an option for those that can't afford.
Regardless of the positive impact reliable public transportation systems can have on the environment and on the life of people, we cannot forget that those systems are vessels are very expensive and not all countries will be initially able to buy them and maintain them properly. That is why you can talk about Japan or Europe while referencing their railroads and buses, but the context is very different in South America and Africa, for example.
Perhaps, some rich countries would be interested in giving some low interest loans for it, since working together against global warming has some enphasis in Europe and America.