So, I don't think we'll ever see an end to it.
There are about 80 better ways to make coffee than a keurig machine; you just need to figure out the two things keurig does adequately; delivering a measured amount of water that is hot but not too hot and a measured amount of properly ground coffee.
And really, does keurig have the faintest idea as to what you consider good coffee?
And it's not even doing this well. More accurate to call it "a measured amount of ground coffee, 'aged' 8 months in a warehouse."
If someone rented a Keurig and then went to add modifications, no one here would cheer it on. It's Keurig's machine after all, and private property law dictate the social rules. Renting and buying therefore have different social rules, laws, and morality attached and companies that try to blur the lines should rightfully be ignored.
Cold brew is much lower acid and less bitter than hot brewed, and much less "plastic" flavored than the Keurig at work.
I used to roast my beans in a skillet on my charcoal grill. It gave them a nice smoky flavor. I haven't done that in a while. (Too much effort.)