That would be very problematic if it occurs, because it would severely reduce and limit the audience for books, especially fiction, versus having a paper and electronic formats model, and that audience would be far less reliable, and the youth audience, which has grown enormously over the last ten years, would then shrink substantially, as would the cash-starved school market. While e-books do help mid-list authors a lot, the loss of paperback would cause a long decline in sales. The problem is that more and more people are being priced out of access to the Internet and technology and reading e-books is exceedingly difficult for them, and those remaining who can do so have substantially less interest in buying books on average. So unless we have substantial changes in society in regards to technology and employment, an all electronic market means a much smaller one. The global expansion may help on that end, but the global expansion is much helped by access to paper books. Returns have long been an issue and obviously will be a bigger one now, but unless the e-book market opens up more widely with more vendors than it has now, there are going to be problems. And Amazon owns the North American POD market through ruthless blackmail and is cutting into returns for publishers and authors by immediately reselling new print books as used. They're still trying to hold on to and increase their monopolies, and while I don't think they'll be able to for e-books, the roadblocks that have been put up to slow the e-book market down are becoming more problematic.