But even now, many video sites employ DRM, and only the weakest levels of DRM streams can be recorded off the screen. If they crank that up, which is perfectly possible today, the screen recordings only shows a blank rectangle, because the encryption goes from server to video card. At this stage, "hdmi recorders" are the next level - they capture the audio/video stream from the hdmi cable output for example.
Even further, there is technology to encrypt from server to screen. I'm not sure on the rollout on this one. I think we have a long time until this is implemented, and even then, I'm sure we will have the ability to buy screens that fake the encryption, and then let us record the signal. And, for mainstream media, there will be pirated copies until the end of time I think.
In the end, nobody will ever avoid people from having a camera pointed to a screen. At least till they can implant a description device in our brain, the stuff coming out of the screen can be recorded. Like in the past when people used to record movies at the cinema with cameras and upload them on emule. Sure, it would not be super high quality, but considering that is free compared to something you pay, who cares?
To me DRM is just a lost battle: while you can make it inconvenient to copy a media, people will always try to find a way. We used to pirate in the VHS era and that was not convenient, since you would have needed 2 VCR (quite expensive back then!) and it took the time of the whole movie to be copied.
DRM just raises the bar a bit for access. For example in gaming, it gives the publishers a head start over pirates. If the game is unavailable for pirates during the largest hype, a lot more people buy the product than otherwise.
Also, sometimes DRM wins. For example, right now, Denuvo is undefeated. Some hardware dongle authenticated software are also unavailable in pirated form. Of course one could argue that eventually these would be defeated as well, but, DRM still served its purpose, in defending the product from unauthorized copying in times when it was most desirable.
To me, DRM hasn't made sense when I was looking at it from a Free Software standpoint, but it now makes sense from a product management standpoint.