If you want to include all the dwarf planets then we've got more than 9. Pluto was only the latest object to be called a planet and reclassified. No one complains about the others.
I really don't get why that would be a problem. Personally, I would be delighted if we had more than 9 planets. "Oh no! We can't have Pluto be a planet cuz then we'd have 5-10 more bodies that we'd have to call a planet too!" So what? Give me 15 planets; hell give me 50, that sounds so much cooler than reducing the number of bodies in the solar system people care about by 1.
Just because you only care about them because they're not called planets doesn't mean nobody else does. You are allowed to enjoy anything you want. Go learn about all the dwarf planets, asteroids, comets, and everything else!
Planet is a useful term to describe a particular thing. We could keep adding more things to the list, but then it becomes less useful. We have multiple words for different things for a reason. A fruit isn't a vegetable just because they both grow on plants, for example.