It's not as though there's no effort to close this loophole (see HDCP and probably others) - I don't expect them to give up any time soon
Granted, pointing a camera at a screen and recording will always be possible - but I say if we ever reach the point where that is the only option, we've lost.
It is not a given that this will always be possible. I could imagine some kind of steganographic watermark in videos - diffused over the entire signal so that it cannot be easily cropped out - combined with a check for the same in all recording equipment that blocks the recording or blacks out the area if detected. Could be done "voluntarily" by all large manufacturers for starters, then eventually mandated by law for all equipment sold or imported into the country.
And there's already precedent for this kind of thing: the way copiers block money bills as source.
Granted, pointing a camera at a screen and recording will always be possible - but I say if we ever reach the point where that is the only option, we've lost.