[PvK]

From the first article linked in the initial post:
"Under the plan, a planet would be any object that orbits a star, is neither a star itself nor the moon of another planet, and contains enough matter that gravity forces it into a nearly round shape."

Er... how much loose dust does it take for it to gravitate into a ball that isn't scattered by the solar wind? Seems like, especially if one goes out to the Kuiper Belt and beyond, there might be many many many of these, and they wouldn't fit an intuitive definition of what a planet is.