> probably for books and movies too
I don't think this will apply to books. How many book-related 'special fan material' do you have? To how many book concerts did you go this year?
This is exactly the problem facing publsihing (and authors) today. While music can get by on concert revenues, what happens to the writers?
While there is some small market for ancilary material for books, is that enough to support an author? Printed works will still be made but they may either be similar to academic work (the funds made from the book are negligible, but they increase status and recognition within their community, increasing the likelihood of academic positions, conference attendance, speaking engagements, or consulting work).
The same may go for tech books as well, though I am not privy to the economics of it, having MS or IBM or Google subsidize the production of the tome to have [author of {blank}] at the company may be of some interest. (Well, maybe a smaller company than those, but the point remains).
I'm not currently seeing a way out for fiction authors at the moment though. Any ideas?