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Jut because they come out with new editions doesn't mean schools are going to require them. If I was teaching a course, there would be no need to switch to a new book unless the content matter was updated sufficiently as to warrant a change. In the case of math, since the way to work problems hasn't really evolved to radically, there'd be no need to update except every 3 years or so; i.e., same book for Calc 1, 2, and 3. Who they really need to hit are the third-world countries who actually reprint these texts and sell on eBay and the rest of the Internet, I don't see downloaded texts being such an issue until portable reader evolve a bit more.
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