I'm unpleasantly surprised that the terrifying pirate scourge would lead to such a move, from inside the industry no less. Even if they have none of the principles that librarians tend to about reader privacy, how many embarassing 'romance' novels do they expect to move under a "Haha, yeah, all your purchases are personally identifiable to a callous and wholly unaccountable third party." framework? (Also, are Dutch ebook vendors totally insane to accept, much less push, a model that is basically "Everything you thought was pretty sinister about Amazon's hegemonic dominion, only with more state power and probably a lot less competence and efficiency!" That will be competitve.)
Also, just by way of perspective, even the odious 50 USC§ 1861, enabler of many delightsome abuses, treats books as a special category entitled to (pitifully limited, because this is the feds we are talking about here) additional protection:
"In the case of an application for an order requiring the production of library circulation records, library patron lists, book sales records, book customer lists, firearms sales records, tax return records, educational records, or medical records containing information that would identify a person"
Right up there with guns and medical records, so you know they think it's important. Being worse than the feds on reader privacy is not a distinction of honor.