Why should this thread be moved to SN? So that the issue can be discussed by those who are already thoroughly aware of the difficulties involved with disabilities/public transport?
It needs to be as visible as possible, because perhaps, just perhaps, some people might read this thread and realise that they've been unreasonable about the wheelchair space.
Life is fairly inconvenient for parents of young children, in a lot of ways. No-one likes being inconvenienced. Everyone would prefer that it was someone else having to deal with that inconvenience. But the bottom line is that everyone can't have a perfectly easy life all of the time - sometimes people have to just suck it up and get on with it.
Many people with disabilities are inconvenienced every single day of their lives. All wheelchair-users will find themselves inconvenienced on a regular basis. If they aren't given absolute priority over a facility that we, as a society, have recognised that they should have, in order to redress some of the imbalance caused by circumstances beyond their control, then all of the inconvenience falls on their shoulders.
There are, for the millionth time, an awful lot more buggy users than wheelchair users. If a wheelchair user always has to wait for a buggy-free bus, then that wheelchair user will always be the one who is inconvenienced. If every buggy user accepted, gracefully, the odd occasion when they have to give way for a wheelchair user, then the inconvenience is spread around.
That's what equality is about. It's not about eradicating every tiny little bit of difficulty from the lives of people with disabilities - it's about asking everyone else in society to give a tiny little bit, so that that all the giving doesn't fall to one, marginalised group.
Life still isn't equal for many people with disabilities. They still have to deal with difficulties on a daily basis. So how is it possibly fair for those who are able-bodied to argue that they shouldn't have to suffer even occasional difficulties in order to even things out?