Client-server applications such as the Web and e-mail will work just fine through CGNs and IPv6-to-IPv4 translators, but peer-to-peer applications such as VoIP

Client-server applications such as the Web and e-mail will work just fine through CGNs and IPv6-to-IPv4 translators, but peer-to-peer applications such as VoIP and BitTorrent, not so much. ... So enjoy your peer-to-peer applications while you can; their expiration date will be coming up not long after 2010. Oh, come now. Every major ISP has a VoIP project to support competition with local telcos. The telcos can see the benefits of VoIP and are or will be offering VoIP soon as well. With http://en.wikipedia.org/wiki/Server_Name_Indication http://en.wikipedia.org/wiki/Server_Name_Indication a major driver of hosting IP demand should decrease. ISPs can provide the vast majority of todays users NAT with no ill effects -- in fact, ISPs could even sell it as a security feature, as you're keeping all of the bad guys away from the end user device. We haven't even started using mitigation strategies in the USA. We have a long way to go before there's any concern -- we might "run out" of public IPs to pass out to every customer, but we're a long way from not being able to sell some services to people because of a resource shortage.