not really. flash is dying, and osx devices is probably going to stop supporting it soon enough, and the rest of the world is going to follow. if DRM isn't in the standard, it illegitimizes any DRM that you have to install, which improves content consumption for users, and hopefully force media producers to use DRM free formats, even when they don't want to (they cannot realistically ask users to install a blob without taking a hit in signup and conversion).

however, if DRM is built-in to the browser, users no longer have a gate to cross, and so DRM media will become the norm.

The difference is, you can, and always were able to disable Flash. Now all that that shit is part of "HTML" and you can't throw away that kitchen sink anymore. Have fun with buggy DRM binary blobs and obscure HTML standards leaking your internal IPs.

I dunno. Back in the Flash days I could guarantee that pretty much any video would play in my browser. Nowadays I have to switch browsers to watch an embedded video on Twitter, for example.