I'm afraid the answer is going to be Darwinian. 1.) Baen books make a solid profit off of e-books. 2.) All the other big publishers don't (won't) sell e-books competitively, and so give up their potentional e-book sales. So... 3.) Over time, authors will start moving over to Baen books (and other enlighted competitors), to grab the extra money.
Currently, Baen maintains a very narrow editorial focus, even inside of S/F. Even so, they seem to be (slowly) broadening their focus, which is going to be eventually good for both authors and readers.
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