Which part of "No" do they not understand?
In 2004 we dumped John Prescott's regional assembly idea. We said "No".
In 2012 we dumped David Cameron's idea for Boris type Mayors. We said "No", all except Bristol, and Doncaster, which voted to retain its version.
We now have Goerge Osborne imposing an elected mayor for the Manchester city region. He put a lot of sweeteners on the table, now where has that happened before, and the leaders of the councils couldn't resist. Without any call to the electorate the deal has been done: democracy anyone?
The vote will probably take place at the same time as council elections to make it look as though there is some sort of turnout. If this charade does get the go ahead it will be imposed on the other city regions. Leeds, with a similar population and infrastructure and the nearness of other cities and large towns will be next. Then Birmingham. Then Sheffield/Rotherham, Then Derby/Nottingham.