DRM does the job it's supposed to which is prevent casual piracy and increase the amount of effort it takes to pirate something. A thief could rob your house if they bumped your lock or just smashed your window. But that doesn't make door locks useless as those have large costs in terms of effort and risk. So the lock is still effective at preventing someone from just walking in and taking your stuff.

It's the same with DRM. Without it, media would appear on piracy sites instantly upon release. DRM makes things harder to pirate, and pirated editions harder to get. And the DMCA makes defeating DRM a felony under U.S. law, so pirate networks are riskier to establish, driving piracy underground. It's doing the job it's supposed to do. It's not going anywhere.