Currently in the mobile space everyone is behind at least one double-NAT at least, and you can order business level access for your wireless data account and ge

Currently in the mobile space everyone is behind at least one double-NAT at least, and you can order business level access for your wireless data account and get an IPv4 address allocated to you. AT&T does this for a single $500 fee for example, Sprint as a monthly $3 fee. I imagine this will become common with ISPs - you'll need to upgrade to a gaming/business class in order to make use of port-forwarding etc and for everyone else, some programs will cease to work or not connect as quickly/easily.