I believe in power in numbers. That being said, I feel that Apple is still not interested in changing AirPlay or rather iOS to allow non-auto-discovery. While there is an ietf effort, it is seemingly filled with tangents, and Apple is pushing 3rd party fixes (AirGroup, etc). One could argue the petition was a waste.
In our higher ed environments wherein enterprise networks are commonplace, it is ludicrous that devices would not support wpa2-enterprise. However, when one looks at the purpose of the device (entertainment, play, etc), it's hard to argue the "enterprise" use case. I'm skeptical that Sony or MS would give our complaint attention.
Nevertheless, I'd likely sign, fwiw. :-/