I can't imagine a world where everyone was the same because for me diversity began at home.
I have two grandma's at home - one who comes from South India and the other from the East. My parents grew up in North India, and my brother and I grew up in two different cities in Western India! Different tastes in food,clothes, music, travel choice - understandably, we argue ..... A LOT!! (argue, as in mostly when we are travelling my grandma would want Karnatic music whereas my other grandma would want rabindra Sangeet, I would want pop music and so on)
But it's great fun too, plus it gives one some valuable pointers about dealing with differences of opinion later in life.. *DIVERSITY MAKES US STRONGER*