Watching the world go by - lining up your foreground subjects like that is great - puts us in their place, we see the scene before us through their eyes.
The motion blur is fine in the background but incidental to the shot. I'm fascinated by the three heads in perfect focus and the red turban in the middle.
Good shutter speed to get the sharpness with the blur in the background. The benches and seats help a lot with the horizonal flow of this image. the orange in the center is cool too, as it draws the view to the people moving above it.