There is a new data-analysis toy called
Google Books Ngram Viewer. "When you enter 2 or 3 phrases, it displays a graph showing how those phrases have occurred in a corpus of books over the selected years."
I played with it, and compared mentions of IPv4 and IPv6. Surprisingly (?!), phrase IPv6 is mentioned more!!
Conclusions? People talk about IPv6, since it needs pushing and promoting; people take IPv4 for granted, since it is already everywhere, but underlying and therefore not noticed.