I m not only talking about skycrapers, i m talking about overall infrastructure, which US didn't build much in the past decade and now the old infra increasingly becomes a problem and even US government admits. You can't rest on your laurels forever, this world now is changing fast by the day, the next time you check, you will be very far behind.
We can't imagine a powerful countries without many big cities, cities are the very important fruits of human societal development and big business and industrial activities all evolve around cities, a country needs vibrant cities for growth and development, not all the countries are fit to become retirement homes.