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On the contrary, I think publishers have a lot to be worried about because this is a first step toward ending the legacy publishing model. Since journal publishers are middlemen that add almost no actual value to the publication process, their revenue stems from access control to published content. The new law removes a large amount of future content from their control, making them more reliant on open access fees. If other countries follow the EU's lead then eventually we will reach a critical mass of open content where the subscription model is no longer tenable. At such a point, stakeholders would be confronted with the obvious question: "Why are we paying a publishing company--which relies on volunteer authors, peer reviewers, and editors--to upload this content to the internet for free?". The next step is collective action to bypass the big publishers altogether, such as restricting grant money from going toward open access fees.