I wonder how long it will take until there is a market for IP addresses. I suspect once such a market is in place IPv6 will not see widespread adoption, since most IPv4 addresses are not really used.
I suspect you're joking, but the old timers really don't like IP speculation. It took them years to agree on the current pseudo-market because they had to figure out how to keep out speculators.
At which point the routing properties of IP will be destroyed (all addresses in a given /16 or /24 routing through the same link helps router performance a lot). I think at that point you'll get a real ISP push to switch to IPv6