Well it might be the reason why iPads and such are a lot more "desirable" to the common user nowadays, they can pretty much do what they need (surf email and some docs) while computer are more for the "pros" as in people who "create content"....wich begs the question, do we really need the word pro on a computer?
The thing though is, back in the "days" resources were limited, and programmes optimized a lot their stuff, or you couldn't use more than a program at the time.
Today we have so much raw power that optimization is not as important, and often not done at all, think about the web, when is the last time you optimized an image for a website(as in size)? I remember in arounf the year 200 spending entire nights trying to shave a couple of KB in pictures to make the site snappier (especially on low connection).
This leads to making the same file in Illustrator CS 4 and the current CC one resulting a couple of megs and the newer one a couple hundred megs... , sure there are compatibility layer added and such, but the fact remains the same exact file is a lot bigger.... why?
Running older HW and SW is not an issue anymore, having standards helped a lot, I can edit stuff in Illustrator or Word using older versions and then simply export in PDF, and I will be sure you are watching the same thing I am.
Yes I am oversimplyfying things, and again not fooling myself, but still It makes me think a lot!