We are in the age of internet. Today children are watching cartoons with the tabletop or the mobile (but a too small screen can't be good of the eyes). An app with a kid-friendly look and easy rules to be learnt could be the hook for lots of new potential players. The preteen wouldn't buy the books, but the comics or the toys. The app would be like an AI acting as a Dungeon Master, showing stats, when a trap is activated, a threasure is found or there is a secret ambush by stalker enemies, but the player would have total control of the stats files, allowing all their own house rules. A canon kid-friendly setting in D&D? Yes, it is possible, something like the anti-Ravenloft, a demiplane created by the dreams of the sentient beings, a oneiric matrix explored by the dreamer children, and nobody can be hurt but only awake by a nightmare. This dreamland could show pieces of worlds with high-tech but the ray guns wouldn't be more powerful than the arrows or other arcaic weapons, because it's the realm of the dreams. A virtual tabletop for children.