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Usually when some group wants to change the language there's some obvious political ambition behind it. You see it all the time. It can be annoying coz it's transparent manipulation but people fall for it.
In this case I can't see any covert motive, can you? Except of course that people on committees like to make sensational decisions. It's called attention seeking and even kids do it.
Pluto is about 5% as massive as Venus but it is fully half as big in terms of diameter. It's kind of spherical and it goes 'round the sun and even has its own moons - sounds like a planet to me.
IAU's definition is that a planet must clear the space around its orbit. I don't think this is a very clever definition coz how do you define "clear"?
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