I think there are many way worse performance habits to develop than wearing glasses. I don't mind it. If he can dance with them and they stay on, then I'll leave it up to himself to decide.
It is very nice to be able to see the audience. Just the stagelights create a bit of disconnect and not seeing people at all might not be an alternative for him. One could even argue that not connecting with the audience is a bad performance habit... hehe
I myself would never wear glasses on stage but I just hate my glasses, period :lol: I see ok without though.
I've been thinking about this post and something bothered me about this video (and others with this lad) and I've finally figured it out- how can he be that good at dance, but permitted to wear his glasses on-stage? When we were kids (and when the tap kids at the other dance school, the folk dancers in a local troupe, etc) we would never have been allowed to wear non-costume pieces while performing... I think it's important to teach kids good stage etiquette and practices from the outset.