By August 20, 2012 may not remain free IP-addresses
If IPv6 does not replace IPv4 in five years, then we will face a big problem - the IPv4 report predicts that by August 20, 2012 there will not be a single free IP address. With this outcome, we may encounter brokers with IP addresses that would purchase them for resale in the gray market.
However, if ICANN selects the unused address space from squatters and deletes it, then free IP addresses will be until 2026. But it is not entirely clear how ICANN will select these IP addresses, because now there is no such policy: any company can say that it needs an IP address and will soon be used. In general, just because no one will give their IP-addresses and pick them up will be problematic.
After reading, you can understand that the only way out is to introduce IPv6 everywhere, but will it be so easy to do?