I'm writing this comment from a Samsung Chromebook. When I use Chrome OS; I'm already giving up my freedom. Chromium itself is open-source, but there are tons of binary blobs on this device: the accelerated graphics driver for the Mali GPU, the ARM build of Adobe Flash, and the EME implementation that makes Netflix work on my device.
EME is not new. There are already devices shipping with implementations, like mine. If EME is standardized, what it means for me is that there's a chance that my device will work with all DRMed content I want to access, and not on a per-service basis.
We're not talking about giving "big bad media companies" full control of the Ring 0 Hypervisor; I am still perfectly capable of flipping the virtual developer switch on my device and booting a pure version of Linux at any time. If I buy a device ships like that, I hope that future me will have the good sense to return it to the store.