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An interesting though, in my opinon, a total waste of talk time.
The few planets we have are already so varied. Rocky, atmosphere devoid through rocky with (varied) atmospheres and then to gassy failed stars. We have moons which would be termed planets if they orbited Sol in their own right instead of exhibiting a rather wobbly path due to their attraction to a larger body.
Whatever is decided is surely going to be an arbitrary line drawn in the solar system's sand. This could be based on composition or size or just about anything else (or combination with anything else) that we can dream up.
I reckon that until we know far more than we already do about our so called planets then leave the term alone. There's every chance that as we learn more our views will change.
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