Changes are need for things to evolve. British Govenment sometimes seems to be stuck in the 19C. As for the US system then no we are too small but in a way it has happened with Scotland having its own parliment, Wales has an Assembly, and NI will if they sort out their silly childish bickering. Too much power in a small area leads to trouble sooner or later.
For our system to work the public has to trust those in power which at the moment they dont.
Happy now.
