As a wheelchair user I see the problem 1st hand but it really all boils down to how ignorant people choose to be, there are many people who no matter what happens will not give up their place for anyone, on buses there was always a place for strollers/pushchairs which could be folded and the mother would carry child in their arms before taking a seat ,if non was available one would expect someone to vacate their seat. With wheelchairs it is very different ,even if the disabled person could manage to transfer themselves into a seat ,there is still nowhere to put the wheelchair.Would it be rude to say that people choose to have children whereas there is no choice if we are disabled.