If it would help, I'm 100% positive that a large group of people would be happy to contribute to a kickstarter campaign to raise funds for you to be able to focus on a book and/or further development of d3 for a year. There's been a few successful kickstarters like this already (Hello Ruby book, git-annex project, and many others come to mind), so it can certainly be done (of course this only helps if the main obstacle is the "everyday" work getting in the way).

In any case, thank you for all your work. It's an inspiration.