I disagree. 
Power flows, and when it finds that a reservoir has disappeared it will simply flow into another space.
I am a believer in bureaucracy, the way that large groups of people get things done. Sure, sometimes it looks kind of goofy, but all in all, Eugene has been well served by its public agencies and its City Hall and City Council. The absence of a strong City Hall means that there will arise a strong...something else, probably a power center that business figures can use to manipulate the public interest for their gain. 
Eugene needs a distinct City Hall. It needs to be a symbol of the people and their public interest. Me, I would fight to put it in the EWEB building, but wherever it goes, it needs to be somewhat in the downtown area and needs to be where the center of the public power is based.
No more hidden private profit at the expense of the poor and the powerless.
Hugh Massengill, Eugene Oregon