I concur with WitnessMyFury and OTWO ... you CAN fade, but expect to be shunned anyway. Perhaps part of your family still "in" will keep on speaking terms with you, one or another may exceptionally keep some association with you, but for the most part, those loving brothers and friends will discreetly shun you. The difference between you and a DF or DA is that normally they won't overtly avoid contact with you if you happen to meet casually. They will be polite, even say they miss you at the meetings, but the conversation will be kept short because, as an inactive Witness, you're no longer considered a "good association".
Unless you physically move out of your territory, you won't ever really leave the radar of your congregation elders, and if you're caught doing anything forbidden to a JW, you'll be swiftly denounced and DF'd (even without you being present at your JC) and the elders will wash their hands off responsibility over you.
As WingCommander said, there's no way a cult will let anyone leave honorably.