Anecdotally, but I've seen people in weekend classes across the last 13 years, and in 2001, it was Glocks, 1911s and a decent set of DA/SA. Today I see all 9mm striker fired guns in a class, and maybe one 1911.
But that could be a "class equipment" thing, like the way people might actually carry leather IWB at 4:00, but since that's a drag in a class where you have to reholster 100 times, they carry kydex OWB at 3:00 in classes. Likewise, not having to deal with the decocker all weekend might be appealing?