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It appears that the latest edition of these books is not available, though in at least some cases earlier editions are. This does indeed seem to confirm that Pearson requires Amazon to have effective drm. My speculation is that this may only be temporary whilst the situation is reviewed. Amazon does seem to have planned for the scenario where its drm is broken in this way and for a quick reaction. It also seems to have catered for this happening again and again. Given that the current drm remains unbroken, it would not seem to be necessary for Pearson to permanently withdraw its e-book versions from Amazon. This, of course, does not guarantee that this will not occur.
Many drm schemes are not circumvented because they are not sufficiently widespread so as to attract the attention of those capable of circumventing them. The purpose of the tools so far as Amazon's e-books are concerned is largely to give people freedom to do particular things with e-books they have "purchased", such as back them up or convert them to other formats for reading on non-Amazon devices. The tools by design do not decrypt books which are not "purchased". I doubt the Developers contributing to the tools gave these Pearson e-books any thought whatsoever, and likely would have had no interest in breaking drm which applied only to Pearson e-texts. The downside of Amazon using generic drm on these Pearson books rather than custom drm is that this generic drm is far more likely to be circumvented.
As for further repercussions, we can but wait and see.
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