That's the argument the nigger who cosplayed Sagan used to promote his planetarium. He was also shilling climate change hoax, so I wouldn't be surprised if Pluto become planet again some time in the future.
No, it’s an argument he stole from white men the 1860s who found Ceres, called it a new planet, but then subsequently found Vesta, Pallas, and the rest of the asteroid belt and then had to come up with a new designation for them because no one wanted fifty thousand planets.
If we find a Mars-sized object outside the Kuiper Cliff (or actually find Planet Nine finally), that will be a planet. Still, the IAU’s definition is bullshit.
Wahaha wrote
The reason it's not a planet anymore is because if it was, uncountable other rocks would be planets, too and instead of eight planets in our system, we'd have hundreds.
That being said, I would find it pleasing if we did just that and then had hundreds of planets.