[WorldMaker]

The "garbage-piled-up-on-grandpa's-computer bad" isn't an isolated incident, and is a relatable category, as you imply in your usage, because it is a common problem. IE toolbar plugins and "special download managers" have never gone away and likely never will, those sorts of malware will continue to just change shapes. Your grandpa probably just wants to play poker with his buddies and his buddies are on Joe's Terrible Malware-Infested Poker Site. Convenience, pragmatism, and social network effect immediacy beats theory, logic, and "long term thinking".

Replace "play poker with his buddies" with "watch movies his buddies are talking about" and "Joe's Terrible Malware-Infested Poker Site" with "Netflix's DRM-Infested Site" and the results are the same every time. Your grandpa isn't likely to care if Netflix has DRM or not so long as it doesn't stop him watching movies. If Netflix, because it's the brand he and his buddies trust, tells him to install a thing to keep watching movies, he installs the thing.

Maybe, maybe you might be able to convince your grandpa to stop watching videos using that thing he installed because it's bad for his computer's health... but there are a lot of "grandpas" out there, it's a huge category of people that "I just want to do the thing and I don't care how so long as it works and is convenient".

I don't think this a question of timeframe, it's a question of do the right thing for the most users. There are a lot more "grandpas" than there are DRM-fighting or at least DRM-wary concerned citizens like you or me.