3catcircus
Adventurer
If you think that a 'short attention span' is an indication of stupid or immature, you either feel like you belong in that group or you have absolutely no idea how people work in relation to products. I even have a shorter attention span then 20 years ago (now 35), it's not like I've become stupid or even less immature, it's other factors. One of those is the incredible amount of entertainment we've got access to. More entertainment generally means more high quality entertainment, so we can become more critical on what forms of entertainment we spent our time on. 20 years ago I was willing to spent an evening of mediocre gaming for a few great kicks, now I expect and want a whole evening of great kicks and find mediocre gaming not worth my time. Part of that is getting older, we have less time to waste on silly things like gaming and want our free time to be filled with quality entertainment. Folks have families, kids, work, etc.
This. 100% this. Us old farts have the families and work. Our "short attention spans" are externally-induced. I've run my campaign(s) for the last 8 years or so using published adventures in published campaign settings using published monsters. I spend the scant few hours a week I have outside of the game (usually 1-2 hrs a night between the wife and kids going to bed and the time I go to bed) thinking about how to cobble it all together into a coherent experience.
As to the youngsters with the short attention spans (whether the 20-yr old hipsters or the tweens) - something that forces them to spend more than 5 minutes on something and to focus can only help them, so in the case of 4e, one could argue that WotC actually contributed to this particular societal problem endemic in western youth.