I could but again, it's kind of a personal preference also. I think that they would be a limited choice. So of you were choosing your Pokemon the only option would be; "Here is your choice of Pokemon. They're all elemental monkeys with little difference between them. Enjoy!"
I admit it would be more organised, but it would tarnish the area of variety. I also have a lot of things created for the current starters in the way of features, storylines and events, so I'm certainly not keen on changing them, I'd rather that just be clear now before this turns into a debate.