Well not of all us did of course but for those of us who gave it up here are 5 reasons why.
#1 New Fads. Like any hobby fads come and go and people, even geeks want to be on the bandwagon.
#2 Boredom. Yes, a lot of us got tired of that play style, especially he crude hand and slash so many of us played.
#3 Drift. A lot of us drifted into 2e and changed bit by bit. Early 2e was very old school but as the rules bloat was added, we just adopted it.
#4 Fatigue. Good old school gaming is tiring work. Newer games require less mental horsepower and just using whats provided spares time and energy real life may have claimed for other things.
#5 Lack of ability to use what we had. Hey, we were young than, not like the adults who designed the game, guys as old as many of us old-grogs. As kids we simply didn't know the best ways to use what we had.
The Return of Planescape? - Curious. There is a brief note on this 'countdown' at Enworld.
13 hours ago