The short answer is not in a million years.
What about all that oil money? Precisely because of the oil wealth Dubai will not be replaced. What every one forgets, Dubai is not towers and malls or amusement parks. Dubai is an idea, a vision and a life style that became a reality not only with money but with the hard work and innovation of Emaraties and expatriates alike, who bought in the vision and dream.
Other cities will copy the parts of Dubai which are money related. They may have higher towers or bigger malls. What they will not have is the dream and the vision that produced the life style and quality of life that is cherished and makes Dubai what it is now, irreplaceable.