The problem might be, that once our non-technical J. Does run into problems with DRM-ed files, at least some of them will blame it on "these stupid e-books" and go back to p-books, at least for a while.
And the rest will discover DRM stripping, and "piracy."
Not unlike the publishers refusals to publish certain popular titles, which often lead to:
--"damn, I got me a new Kindle, but I can't find any Harry Potter to buy...."
--"oh, no problem. My nephew showed me this new site where you could get it...."
I think the publishing industry would love to kill this whole e-book thing, except that they can't.... But, I suppose the e-book thing might kill some of the more obtuse publishers.