A different education and background
I am not going to show AD&D glossy manuals to my nephew's eyes when he is 12 or 13 years old.
I will show him another fantasy rpg instead. At that particular age, if you are slightly interested in fantasy, you are bound to fall in love with the first game you ever see.So, why another potential AD&D players? The world is already full of them, one more is not necessary.
I will show him a different fantasy rpg.
May the same fate have befallen to me!
Sadly, i was shown AD&D, and it wad hard and difficult to discover all the rest afterwards.
The first fantasy rpg you stumble upon, is the one you'll always love.
AD&D players are everywhere, the world needs that other traditions, others niches, be continued.