However the man himself talks sense. From the piece:
To do this you need a long-term plan. Two great acts would symbolise this change in thinking: to demolish the Cahill Expressway and train station that sever the city from its harbour (the trains then go underground); and to bury the Western Distributor, whose spaghetti-tangle throttles Darling Harbour and cuts it off from the lifeblood of the city.
Freed from these constricting bands, the city centre will breathe again and be open to its harbour. It will be a welcoming place for people from all over greater Sydney.
Meanwhile, there are other steps to take. Sydney needs a coherent, attractive, walkable north-south link. All great cities have such a street - think of the Champs-Elysees in Paris or the Ramblas in Barcelona. It could be George Street, the city's most historic street, linking the two great doorsteps of Circular Quay and Central Station. But who would dream of walking this great street, clogged as it is with buses and angry traffic?
But close it to vehicles, allowing only buses and bicycles, provide wider footpaths, canopies of trees, and three great public squares at Circular Quay, Town Hall and Central Station, and watch what will happen.
It becomes the great organising spine, with a network of vibrant lanes such as Angel Place and small plazas such as Regimental Square running off it.
As well as observing that the city is choked by the internal combustion engine, Jan Gehl notes the key symptoms of this, which is the near-absence of the very young and the very old from the city centre. Think: where in the city can you find a children's playground? And why, in its current choked state, would you take a child to play there?
Pete wondered in his comment on this entry whether Prof Gehl's vision was utopian; however it is worth noting that he has seen a similar transformation to the one he proposes take place in Copenhagen over the last 30 years.