I think the first post is built off of a false premise, that the gaming community universally opposed DLC. What you are probably remembering is the vocal reaction to a few high profile dlc items that were not well received. It doesn't mean the very premise of dlc was rejected. What exactly are you opposed to with Downloadable content that adds to a game? I understand that there are specific instances where it is executed poorly, but for the very idea of DLC, what is the opposition?
Also let's back up to the idea of whether should be a universal opinion by the gaming community in the first place. Gamer groupthink is problematic itself, especially if rejecting an entire idea based on the knee jerk and reactionary opinions toward a few early and misguided attempts at testing the waters with DLC.
Also you keep going back to the separation in opinions being generational. I'm certain that many of the posters here are able to remember the years prior to DLC, it wasn't that long ago. So is the generational difference purely due to older gamers not being able to accept a new delivery method for gaming? The very idea of expansion packs and DLC are same, giving you more content to a game you already own. It's semantics to somehow differentiate and separate them. The only reason we have more DLC rather than expansions now is because the ability to deliver smaller chunks of content is now feasible, whereas before companies had to wait until they had enough content for it to be reasonable to sell a boxed copy in a retail store. Why wait to package an extra level into a larger expansion when it can be released when available?