Is This Our Floating Future?

Related:

Future City: Experiment and Utopia in Architecture

Take a look at this artist's impression of cities of the future.
What do you think about that? Would you like to live on a floating city? Do you think it's viable even?
I wondered about this and thought that given the overpopulation and food-production issues of the planet it might be a way for us to move onto water without damaging that envrioment, while freeing up the land to produce our foods and fuels etc.Of course, there's always the issue of waste production, and what to do with it, so I'm wondering if a city of this kind can be semi self-sufficient?