This article hit on a few things that I was trying to explain to another gamer the other day.
It's tough to explain. Let me make a comparison.
I remember reading a Sci-Fi short story during middle school were kids from the future find an ancient relic called a "book". They don't understand it. It only reads one way and when you are done reading it still has the same words on the pages. They were used to computer monitors and the constant flow of information. So they figured people must have thrown the books away after reading them.
They didn't understand the value of the book or the act of reading. To read a good book and then be able to read it again in the future is something awesome.
It's sort of the same situation with newer gamers who do not appreciate single player games. Some good games, like a good novel can be enjoyed again. And it's the solitary act of enjoying it that really makes the experience special.