If the web does not have DRM then consumers can only use services like Netflix where Netflix deigns to create an app (plug-ins are on their way out).
But what is being proposed, is identical to that. Consumers will only be able to use services like Netflix where Netflix deigns to create an implementation of their proprietary EME plugin.
If DRM is a standardized part of the web then anyone with a standards compliant browser can access those services.
This is where the confusion lies. Nobody is suggesting making DRM itself a standardized part of the web; you're rooting for a side which isn't in the fight. They're talking about making a non-standard DRM component (something just as unportable as Flash and Silverlight, and subject to its ONE CREATOR'S whims) have standard API for the browser to use. This is a tiny little issue; Flash already used a defacto-standard API for the browser to inferface with. Such a defacto interface isn't maybe as good as a well-described one, so you could see this new API as a minor step forward, but it comes with the cost of legitimizing and endorsing something which is just completely ridiculous.
I want the choice to be able to stray beyond the dominant platforms and still use Netflix.
That is not being offered by this HTML5 compromise, and it won't get you closer to that. If Netflix, as the one and only party in the world who will have the closed trade secret to make the Netflix decrypter, should decide to ever see fit to allow the specific non-dominant platform that you're thinking of, to join the list of platforms they support by making a Netflix plugin for it, they're just as likely to decide to allow an app on that platform.
Allowing you to watch Netflix, is not something that is being standardized. That aspect would remain as closed as Flash's DRM. This is how all DRM must always be. The only way Netflix can ever be standardized such that you will be permitted to use it on a device of your choosing, is if they drop the DRM.
Or if they were to standardize the DRM itself, I suppose that would work. But they wouldn't want to do that, since the whole point of DRM is to keep people from implementing it!