It is not a matter of if, but when, IPv4 address space will run out. Address re-use is a short-term solution that restricts facilities. Scarcity of IP addresses will lead to rationing, either by arbitrary control, or by price. With IP Version 6 (IPv6) [also sometimes referred to as Ipng] there will be no scarcity of addresses.
Address re-use mechanisms work for people who just use e-mail and the Web, but it is not viable for servers, which need dedicated IP addresses.
Today, customers of ISPs cannot change service providers without changing IP addresses. The ISP can't change its backbone connections without changing the customers' addresses. Avoiding address-change disruption causes "lock-in" for customer and provider alike.
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