Joker,
I've met recovering alcoholics who have been going to an AA meeting a day for 40 years, and don't intend to stop until they die. I've known others who got sober with constant attendance at the beginning, and stay sober with weekly/monthly meetings. For me, once admitted I had a problem and decided to quit, I did meetings for the first three years and then didn't feel the need to continue. (I'll be 14 years clean & sober on July 1st - woohoo!)
For me, I see recovery from being a JW as being very similar. Everyone has their own "bottom" (when they really decide it's time to change), their own need for support (weekly/daily/hourly), and their own comfort level for participation (share every day, never share, share only when it "feels right"). And many of us take comfort in being able to help those who may need it, just as we did at the beginning.
So I think the answer to your question ("Don't you think there will be a point when you won't talk or even mumble about Jehovah's Witnesses?") will be different for each of us on this board; for me, the answer is "as soon as others stop needing to hear about it."
DivaMom