vortexhlp wrote:I feel like this will end up forcing websites having mirrors of themselves which could cost twice as much until the transition is over =/
Not necessarily. A server can be assigned both an IPv4 and IPv6 address, or many addresses. Any website on that server can respond to both an IPv4 and IPv6 request. Where the issue occurs is typically at the DNS, infrastructure, and client level, with clients being the least of worries since all major OS's at this point fully support IPv6.
IPv6-only is the issue. If a site is also accessible by an IPv4 address, there's no issue at this point.