I think that for a scooter to be a convenient way to travel between the nodes of public transportation it should be capable of disassembly down to something that can fit into a legit-looking carry-on luggage and also the recharging aspect should be sufficiently simple and quick, e.g. by carrying an extra battery to swap for an exhausted one or using chemical fuel. So is there something like that on the market nowadays? Have people who use buses and trains ever been noticed in using scooters in any significant numbers?
Incidentally, yes, I am aware of schemes like ubiquitous freely available bicycles for everybody in the wonderful world of Denmark, but nevertheless am more interested in the less-utopian approaches that could be done by individuals.