The end for elected Mayors?

I've just seen the news that voters in Stoke-on-Trent have voted to end having a directly elected Mayor. (BBC News: City's mayor to go following vote)

Now I don't know much about the politics of Stoke-on-Trent and it seems that they have a unique set-up for running the authority, so this may just be a local matter. But the actual question is interesting:

Are you in favour of the proposal for Stoke-on-Trent City Council to be run in a new way, which includes a councillor, who will be elected by the councillors of Stoke-on-Trent to lead the Council and the community which it serves?

Whatever the details this question is effectively describing a standard councillor led system. I wonder what the results would be if Newham held a fresh referendum on whether or not to keep its elected Mayor?

Of other note the turnout was just 19.23%. One has to wonder if there shouldn't be a threshold for referendums that carry major changes.