I think you have to be realistic about what is actually achievable.

Just consider the consequences of slashing parking availability on Devonshire Road in half - house values would plummet, and lots of the residents would go absolutely ballistic. In that atmosphere, there is just no way the Council will do anything at all.

The real problem is that the situation has been allowed to get where it is now. If you're really public-spirited, the first step has to be to remain vigilant for where obstructive footway parking is just starting to creep in - if it's jumped on before it gets established, at least the situation won't get any worse. And there's a real possibility that the Council WILL take action to stop it becoming established anywhere new - so long as they are put under considered but determined pressure to do so.

In the longer term, I guess the solution is many fewer and/or smaller cars.