Come on now, I've said many times that there are no demotions, and this script runs from the beginning; if you've ever been well above 50% activity, there is no reason to worry.

The way it is supposed to work is that 50% activity indicates a contribution to the forum; it is hardly likely to get to 50% activity without getting noticed, and a user who achived this would probably be recognized by many if they left and came back. 3 months is a true measure of seniority; the senior members after running this script have all been active longer than the members.