[HiTech RedNeck]

My guess is that textbook publishers will seek to thwart this by presenting the same information in "rearranged" ways in different countries' English language editions, making the overseas books more difficult to synchronize to American instruction. E.g. rearrange chapters where the information is relatively independent from chapter to chapter, and regroup chapters in different clumps where it is important that the knowledge set progress as the book progresses. Modern XML formats would make this almost trivial.

[Fresh Wind]

Actually, all they have to do is revise the "review questions" at the end of each chapter from which homework is assigned. The content never has to change, but there are new questions every year. It's a perfect way to screw the students!