This is always a hot topic of discussion and many people have asked me why I play completely left-handed. Sometimes I wish I was forced to just learn how to play right-handed, but now looking back on it, who knows if I would've kept at it had that been done?
If you have a child that naturally leans one way or the other, I don't think forcing them to do the "right" way is the right thing to do. Like I said, if people are wired a certain way, your job as a teacher is to exploit that way and make the student enjoy what he's doing and excel at it, no?
Yes, I don't get a chance to sit-in that much, and when I do, it's always a hassle to switch over stuff - but I only flip the snare, floor tom, and hi-hat, I leave the rest of the kit the same and make do. But I've also played a lot of situations where I'm the drummer so sitting in to network hasn't had to happen so much.
Being completely left-handed hasn't hindered me that much. Even in drum corps, I learned rudiments right-handed because IA had to match the line, and that gave me this ambidextrous thing when I was done with that phase of my life. I just think I wouldn't immediately shoot down a student because he plays left-handed and force him to do it the other way. If the student wants to switch, then that's another issue, but I wouldn't just make a judgment call like that because I'm "the teacher".