In this poll, I voted for the CP requirement. However, what I really think we need is something in between the two. I'm okay with a permit, but I would require it to be paid in vouchers only and make it a little cheaper - 10 vouchers maybe? There was a time when vouchers were "valued" at $1...
Then, I would also require a certain amount of ownership of cards, I'm not sure the best way to do that - some version of CP.