Re: "based on an interoperable open standard"
You need to visit a third tier city like Bristol. The buses are extraordinarily expensive and unreliable. The urban rail north of the river is a dream but doesn't really go to the right places.
The thought of having a town/city wide smart card for public transport for many of the UK's inhabitants is a wild dream, and the thought of it working interoperably in other cities country wide is some sort of utopian day dream.