I'm really not sure how to feel about WEI. On the one hand, it's DRM, and all DRM is bad. On the other, maybe it will finally present an opportunity to stop pretending YouTube is a viable way to share videos.
But there is another way it could go: if anyone can come up with "good enough" and "lightweight enough" DRM that most people will just allow it and get on with their lives, it would be Google. And it could become REALLY INCONVENIENT to avoid it. Computing freedom could be about to take a huge step backward, like it did with the jump to mobile, which was pretty much a death blow.
It doesn't matter if you have a general purpose computer on your lap if a huge fraction of what you do runs in a tamper-proof, surveillance-ridden VM controlled by someone else.
Sure, we can continue to do things outside of it, just like we don't have to use Android or iOS to do anything. But how many people reading this don't carry an Android or iOS device everywhere with them, or even use an open source Android distro? The web landscape is horrible enough already, with even Microsoft not able to maintain a viable browser (and after watching Liz's tribulations with Safari I'd say Apple can't either). And now Google wants to make fully open source browser implementations completely impossible. And I suspect they will be successful, because people just don't care.