ARIN has no control over what protocols people use on their networks. They're only responsible for the allocation of new publicly-routable IP address ranges for North American customers.
They've been quite clear and vocal about the fact that they're rapidly running out of addresses and will soon be unable to fulfill requests. There was no urgency when ARIN received its last global /8 allocations four years ago, and there doesn't seem to be any urgency now that we're seemingly weeks away from entirely running out. I don't know what it will take to make people pull their heads out of the sand.
