Simple solution?
All the discusion here is technical stuff that seems to me to be irrelevant. The technology is mature, tested and in use, and at some point we will need to take the corset off, so given no better solutions the question is how to do it?
What it needs therefore is for a major trading block (the EU or the US from a western perspective) to mandate that all devices brought onto the market after a given date only use IPv6. This then pushes usage up with little cost and will drag the rest of the world along. The EU has well establised processes for regulating changes like this and could lead on it. The US ability to regulate is a bit more chaotic it seems.
A I missing something here?