It hasn't happened all of a sudden though has it. We haven't gone from thinking this is 100% fine and profitable to not fine and unprofitable overnight. It's been happening for the past 50+ years.
Whether its TV contracts or Feminazis (how old are you, 11?) money talks in sport as I am sure you know (I assume you know). The TV contract people, the F1 people, the darts people etc. have all reached the point whereby it is commercially beneficial to not having half naked women parading...
F1 and darts are free to choose half naked women parading around if they want, no one is physically forcing them to stop doing this.
As nigeyb has posted above is a business decision to not have them, i.e. they think they will make more money without them, just as they were introduced to make...