Thomas Shey
Legend
Going back about six pages...
I think most of the long term groups I've been in have tried different games: Gamma World back in the early 80s, Star Frontiers and V&V in the mid 80s, Twilight 2000 in the late 80s, VtM and Star Wars in the 90s, Call of Cthuhlu, Shadowrun, Brave New World, Fate, and 13th Age in this millenia. I'm trying to think back, and I think there was one group in the early 80s that only played D&D (but that DM ran lots of other games for different groups), one in the 90s where we only played D&D (two unrelated long campaigns), and one recently that only played D&D (a shortish campaign and a follow-up).
I can understand a long-time single campaign groups not changing systems. And I can understand groups that don't stay together more than one game or have mass turn-over of members and that need lots of recruitment not changing. But for the long time groups that play together (maybe with partial turn-over as the years go on), is it uncommon to try multiple things?
Its hard to tell how "common" it is, since it appears likely that at least some groups that do that have limited turnover and thus tend to be kind of encapsulated. I do get the impression from things I've seen over the years that long time groups that are D&D and only D&D are hardly unknown though.
(Yes, it seems odd to me too; the groups I've played with have rarely stuck with the same genre, let alone system for two games running over the years. Even games we reused a lot were in alternation with other things).