There's a practical, less-controversial, economic reason for marketers to stop using booth babes...they are a hopelessly outdated marketing technique. Booth babes aren't targeted, can't be a personalized experience (wearable LEDs aside), and aren't strategic to my tech brand. (Unless, of course, I am running a modeling site.) Not to mention that I can't quantify the ROI, or optimize the results. If I were back in the marketing saddle, choosing from current platforms and techniques, I wouldn't allocate spend to decorative meat sacks...no matter how lovely.
"Don't you dare bring boobs into this. Don't try to deceive me with cheap and misguided arousal. This isn't an army base in the 1950's. I can get boobs at home. I don't need you trying to pathetically circumvent my genuine interest and pushing a marketing technique at me that has been around for several hundred years. More people are interested in video games in 2013 more than ever before. They are interested in video games, not your banal song-and-dance. Video games are exceedingly creative. You are not."
...and to the extent looks matter, maybe I could just hire professional hair and makeup for the good sales and marketing folk who *should* be on the front line with a potential customer. Just sayin'.