@Miss-Demeanor said:
"Theme normalization" makes it sound like its supposed to happen, or is a good thing. I think its more of a hijacking or kidnapping than anything. Its a conscious effort put forth, generally by a group of compatriots with a like-minded goal, who will not hesitate to make life miserable for everyone if they don't get their way.
From another angle, is it a good game if it's demanding an experience that players don't actually want? In my experience, it ISN'T a single group of unified people who are actively running off all the silent masses who want to play the game The Way It Should Be Played. Rather, it's the simple fact that people aren't as devoted to playing within a given theme as they might say they are. A lot of people say "Oh god, Winnie the Pooh bars in the Hedge - it's the WORLD OF DARKNESS"...while, at the same time, they're totally running their Victorian tea houses, or playing Biker King of the Wastes.
When it comes down to it, quite a lot of people want to play something that's fun, has an element of wish fulfillment (wish fulfillment about being an over-sexed, druggie biker who turns into a ragewolf without having to worry about cops or consequences is as much wish fulfillment as the pretty sparkle princess with her true love) or power fantasy, and is easy enough to get into that you can go from contemplating to playing within a day or two.
While I would like to see more games with a stronger theme, I don't think that the theme drifters are actively setting out to "ruin" a game, and I don't think they're a unified crew of saboteurs - they're just players. Playing what they consider to be fun. I feel like, if you want a stronger adherence to theme among the playerbase, you have to show the players WHY and HOW playing to the theme you're hoping for is going to be fun for them.