It is my opinion that the GB is still naieve about how many are actually "faders". I have been surprised since I left how many knew how to play the game. So often as I read about the different stories of faders here and on other JW forums, I find myself looking back on my elder days saying "So THAT is what they were doing..." Esp if faders play their cards right and just claim that "depression" is bothering them, there really is no way to pursue the matter. In addition, the elders are overwhelmed just keeping up with the basics of the job. There are no resources available to chase down suspicious faders. The policy of the GB is to let apostates reveal themselves. They claim that this is evidence of Jehovah's spirit in action... lol! So is cleaning the toilet at the KH to these yahoos...
Fading is still the best option for most. Esp if you are able to move, there is no way they can catch up with you. Most elders can't even keep up with their book studies so they aren't going to after someone without their typical "evidence". Just because you go missing doesn't mean you are going to be disfellowshipped.
Marking is an entirely different matter, and this may be a tool the GB can use in the future imo. Certainly they don't need a whole lot of reason to look down on people, and depending on the mood of the local elder body, they can make a case for marking. Of course, marking doesn't cause shunning, and it is highly unlikely that a fader is looking for a whole lot of association with JW's they aren't related to. And you can't name names in a marking.
I can't forsee a circumstance that will allow faders to be pursued.