I'm new but I'll sound off.
This is a great idea. I like net handles and nicknames (and am fond of mine

but I like the suggested use of real names.
Two reasons. First because of the desire in traceurs for a tight-knit community. This is where parkour came from and how it has grown, and using our real names can only help that. (It's really hard to go to a meet and say "Hey, coolio_78! How've you been?")
Second, and leading out of that, because of the hope to further legitimize parkour. Nicknames are fine on the internet, but most of the time that's really where they should stay. If we are to be ambassadors of parkour outside of these forums, we have to present ourselves in a professional manner, and if I went around calling myself "spectre_general" to people asking me questions, no one's going to take me seriously.
That said, I don't think it should be mandatory. Nicknames are fun, and there's lots of good reasons for anonymity online. But I'm opting in.
Uh, that is all.