>- Some of the top authors from a few years ago are now publishing courses on Pluralsight. (I had opportunities to write some, but have just been too busy with other things.) Some of the top Pluralsight authors are making more $$$ than they ever made on books.

I would tend to agree with that. Unless J.K. Rowling or other well renowned authors, nobody would make a living on that, or any sort of relevent ROI that would justify something in return. Writing books, for most authors, relies mostly on sharing a knowledge to the readers, and also, as well as for the personal interest into such venture.

>- Technology changes more rapidly than it did during the heydays of Fox. That's not a criticism of Fox - just a reality. Let's take Power BI for instance. A few people are publishing books on Power BI - I'm sure the books are good, but too much changes in the technology by the time the book is available.

It's never been so true. Anything in regards to technology has to be published fast. However, unless already in the loop, the publishing process takes long. By the time the book is published, one would say a few additional chapters could have been inserted.