A temporary badge would work and there is certainly a lot of folk who would benefit from it.
The problem I see with that is it need more funding to administer because I believe the numbers eligbile would be vast, although over a short period, in comparison to someone who is permanently disabled. It would also mean that there are fewer spaces available to those with the permanent blue badge.
The P&C spaces are often used by people who struggle with mobility or temporary disablement but who wouldn't dream of using an official disabled spot.
If we could persuade supermarkets/shopping centres to simply make spaces bigger in general and better plan the allocation of disabled spots and ensure that all spaces have access to a safe walkway, then that would be great. It would take away the need for specific P&C spaces as access and safety wouldn't be a problem.
In addition, I think the labelling of certain spots near the shop as priority for the elderly or infirm then perhaps people would be considerate. Not all of them of course, but then not all people are considerate at the moment.
If everyone was happy with the status quo then there would be no argument for change, but everyone moans on about it constantly.
It's all very well whingeing on about P&C places as totally unneccesary, perhaps they are in some cases, but not all and to suggest we do away with them without any alternatives is just silly and spiteful, since their mere existence doesn't actually inconvenience anyone.