Richard Register is a dreamer, but his book will make you look at your city from a different perspective. The text makes extremely good points about clustering development into mixed use centers to preserve open space and reduce transportation costs. His comment that "proximity is the most efficient means of access" was profound- ie, the cheapest way to get someone to an amenity or job is to have the amenity and job nearby already. After reading the book, I started to see the possibilities of remaking my own town for reduced traffic and better pike and ped access, and intensification in the right places.
What was frustrating and distracting is Register's obsession with vertical structures. Throughout the book, we are treated to sketches of remade cities with additions gradually piled on top of existing buildings, festooned with pedestrian walkways and keyhole view sheds, leaving the city looking like a giant lopsided wedding cake. I buy his argument that we shouldn't limit ourselves to 4 story buildings, but it is silly to think people could just keep adding on levels to buildings regardless of structural capacity.
Also, he barely mentions how people would make a living in these new, mostly car-less ecocities. The assumption is that people work near home. Are we all tele-commuting? Producing local goods? Assigned to a local industry? This seemed to be a major fault.