ipv6 will FAIL if it is forced to implement now.
First - Most of resources unavailable over it.
Second - there is no solid ipv6 carriers available. They are fighting non-stop for new market and unable to make all ipv6 internet as one piece. Let them regulate and force them to make all internet available there.
http://mailman.nanog.org/pipermail/nanog/2009-October/013997.html