And thus the internet becomes as convoluted as some local phone systems that still have party lines or do not work with touch-tone phones! (yes, sadly there are still places like this)
Actually it shouldn't be bad, they can just subnet mask the entire internet under one ipv6 address and leave it as is, while all new devices will go by the new standard, so no worries! Besides, this just means that the last of the A/B blocks have been allocated to gov'ts and corps, they have yet to be assigned to end-users, that will take another year or 2 at least. And as someone else mentioned there are entire A blocks assigned to Gov'ts that are still untouched. Think of it like video game sales, they track how many games have been sold to stores, not how many have been sold to individuals. Work in retail long enough and you know there is a big difference between the two.
On the other hand, it is kinda neat having a single dedicated IP address for every device that you own! Soon internet providers will be able to bill you for each computer, laptop, PDA, cellphone, blue ray player, game console, etc separately! Imagine $30-40 for internet access per device! Sure it will never happen, but don't think that Comcast and Time Warner aren't thinking about it!