The think I find mindboggling about all this is that I have yet to see a
concise explanation of how the great transition to IPv6 is going to be
managed and what the incentive for early adopters is going to be.
There isn't going to be a great transition to IPv6 in the sense that
you seem to mean. IPv4 and IPv6 will coexist for a long time. The most
popular IPv4 applications - web and email - will be the last to abandon
IPv4, and they won't do so until IPv6 is ubiquitous.
The incentive for IPv6 adopters is obvious - they'll use IPv6 to do
things they cannot do with IPv4. Those things include: deploying lots of
distinctly addressible pieces of hardware (e.g. things that get monitored or
controlled remotely), alleviating an actual or imposed, global or local,
shortage of IPv4 addresses (this applies both to China and home networks),
talking to IPv6-only devices (that use IPv6 because they cannot reliably get
enough IPv4 addresses), and any apps that cannot reliably operate through NAT.
You might say that there isn't much use of these things today. But when you
think about it, enabling new kinds of ways to use the Internet infrastructure
is about the only way for ISPs in saturated markets to get new customers.