Another aspect I just thought about was that in 90s and 00s there was a lot more diversity of games that were popular. Most people I knew played at least 2 or 3 different games with very different styles and I knew lots of people who never played DnD. Now everybody I talk to seems to play DnD only.
Just the fact that the tile is "D&D map makers..." instead of "RPG map makers..." is very telling.