I'm concerned that this will do nothing but result in fewer government awards and make non-governmental research more difficult to access. This directive still allows journals to charge open access publishing fees, which often exceed 12,000k, and allow grantees to add this to their grants, resulting in fewer grants.
In addition, there will be no upper limit on open access fees, so privately funded research will essentially be required to opt for closed access publishing so they can avoid the fees. This means it will save nothing for most users of these journals (academics) since now they will have to pay to publish and subscribe.