I agree with this as well, but I would counter that it's not just books that these people are getting online. These would be the same people that buy from online sites to get their armies at cut rate prices, and then also go and use the same store space as those like your self who are buying in store. I certainly support my FLGS as much as possible, but they know that OOP stuff I'm better off getting online. However, there are a number of players that buy all their stuff online that play at the same place, but they have legit books as well. I don't see it so much as getting stuff for free, as I do getting the same stuff at the lowest price possible because they're cheap (the people, not the items). You're going to have these people no matter what, like it or not. Just do your best to convert them to the ways of the FLGS for what they need.
Directly to the subject, I could see GW doing digital versions, but they would be full digital e-books, and not downloads for a pdf reader. You'd have to pay full price and own a kindle or sony reader to be able to use them.
John M.