Paul Farquhar
Legend
Maybe D&D is more dominant in the US? I'm in the UK too, and most of my players play other RPGs too (WH 40K, Paranoia, Pathfinder, Blades in the Dark get mentioned).While I believe this is true it always surprises me.
I've never met a gamer in person that just plays D&D, or a DM that just runs D&D, yet it seems a common thing on the internet. I guess because when I meet gamers outside my own groups (which play all sorts of RPGs), it tends to be at conventions and conventions (at least in the UK) tend not to be D&D focused, they are a multitude of different systems often with people demonstrating the latest releases or indie game they have discovered.