I dont think a long game is the pinacle of the hobby. I think a short and to the point game is much better. Especially as we get older and our free time is shorter. No more time for 24 hour game sessions like in high school.
My opinion is probably coloured however by a disinterest in "epic" novels such as the Wheel of Time and Game of Thrones and more of an interest in short to the point stories such as that in the Sword and Sorcery. Fafhrd and the Grey Mouser and old school Conan for example.
Those stories (even though when you put them all together they are quire long) really hit hard and fast. Why not have that in a game?