Digital content is not forever. If I can't purchase it and download it to my local hard drive, I'm not purchasing it.
Reminds me of those old anti piracy PSAs: "you wouldn't download a car." (note: yes, yes I would if I could).
But if the new car-buying process was "pay $20k for this Honda Civic, but just know that we are just allowing you to drive it, we can take it away from you at any time" you can be sure that either no one will ever buy cars again, or they'd just "steal" them.
If compliance is too hard or too inconvenient or just plain stupid or malicious, then people won't comply. Easy as that.