>for subscription services DRM doesn't even get in the wayYou are saying that some DRM doesn't get in the way, how is it exactly? DRM prevents users from using their system of choice, since DRM is practically never cross platform, and DRM stands in the way of copying (that's what it's created for) i.e. in a way of copying for legitimate purpose such as format and time shifting, backups, accessibility and various other applications of fair use. To put it practically - can you use Netflix on Linux let's say? Not without jumping through some weird hoops. Can you make backups from Netflix content? No. So I'd challenge that it's transparent and doesn't get in the way.
> It's a necessary evil, I fear.
No, it's an unnecessary evil. And there will be online content without DRM - content creators just need to come to grips with reality and do the right thing. DRM doesn't add any value - it only degrades it for legitimate users.
Content creators have two ways forward. First is dropping all DRM, which makes experience better for end users, and respects paying customers. It doesn't stop piracy, but it provides incentive to buy from those who treat customers with respect. Second way is pushing DRM, degrading the experience of paying customers and treating them as potential criminals by default. This way doesn't stop piracy as well, but such disrespect towards legitimate paying users doesn't create any incentive to deal with content creators and distributors who treat people this way, and artificial limitations which degrade the experience and flexibility of such content reduce the incentive even more (guess what incentive they increase? Exactly - for piracy).
Music industry realized that DRM doesn't offer them any benefits (and only offers disadvantages) so they dropped pushing it. Other industries are still catching up with the idea, but they'll come to it. DRM as a trend is dying, though in many areas DRM free distribution channels are still a minority. You can get more and more DRM free e-books, DRM free distributors like GOG and Desura show that it's not needed at all for gaming. What's really dragging behind is video distribution. Besides DVDs where DRM is trivially removable, there are virtually no DRM free channels especially for streaming. But I don't see any conceptual difference between music, books, games or videos and etc. In any of these cases DRM offers nothing positive to end users (totally on the contrary) as well as doesn't prevent piracy. So as a trend - it's dying but it will take time for it to be gone forever.
My whole point was - it doesn't make sense to make a Web standard out of a dying trend which on top is unethical and user hostile. Therefore Netflix is doing a really bad thing with pushing DRM into HTML standard.