I really don't understand the debate...
I do not know why this is an issue- If you decide that Pluto and UB313 are not planets then you still have to come up with another name for all the large bodies in our solar system.
If you define a 'Planet' as a body orbiting the sun with enough gravity that it has assumed a spherical shape, then Pluto and UB313 are planets.
If you define a planet as "a body orbiting the sun with enough gravity that it has assumed a spherical shape with an inclination to the ecliptic less than 15 degrees" then they are NOT planets.
Personally, I hope UB313 is classified as a planet, by my motives are purely selfish...