I wonder if this will finally kill Firefox? Imagine a world where FF can't play YouTube or watch Netflix? What if DRM content becomes so prevalent it FF will render most websites like Lynx?
That is the future we can very well face unless we oppose this DRM evil now, at its root, before it enters our HTML standard.
Don't attempt to be "pragmatic" about this one; be principled. Stop using any browser supporting the EME initiative.
Perhaps the fragmentation it will cause will destroy closed media on the internet as a whole.
Nothing bad can come of it.
It almost certainly won't. The majority of consumers won't care (or even notice) so long as good products are being made with the technology.