The word planet has been basically an arbitrary categorization. For it to be a useful term, it should have a consistent definition. If the most useful and consistent definition disallows Pluto to qualify, then we should cease to consider Pluto a planet for scientific discussion. However, that doesn't mean you personally cannot consider Pluto a planet. You can do whatever you want with it, it's just a word. Just recognize that you're departing from the conventional scientific meaning when you use it that way. As for me, I consider Pluto a dog.