If we assume that there are less converts and more born-ins who are getting baptized, would the above statement of yours take the premise that more and more JW kids are staying in the religion and then having kids who are becoming JW's, thus repeating this cycle and the rate of publisher increase is equaling the world population growth?
It would appear from past figures that in places such as USA, Canada, Europe, Japan and Australia, this is what is happening. There seems to be few converts, and the numbers are made up of born-ins. Unsurprisingly, numbers are stagnant in such countries.
In Latin America and other strongly catholic countries, there is still growth. In Christian African countries, where there is strong population growth, there is often a massive increase in numbers and a lot of those countries already have higher ratios of JWs to population than many Western countries.
Because, if JW's have low retention rate( born-ins are leaving the cult) and outside converts are also less, then the peak publishers should go down at some point.
That is probably already happening in some Western countries. On another thread I all but proved (using Australian census data) that decline is now inevitable. Better to just rely on “average publishers” not “peak publishers” when trying to work out what is going on, by the way.
For e.g. In my congregation of 40 publishers, almost everyone is a born-in JW, i.e. all had witness parents. There has not been a single convert in years, but the publisher number is increasing because existing witnesses are having kids who are growing up as JW's. So, in reality, in my cong, born-ins are staying in the org. Is this a worldwide trend?
From memory, you are in India? In many Western countries, a number of born-ins leave when in the 15 to 25 age bracket, but a lot of them drift back in, particularly when having their own kids, sometimes dragging a spouse in with them.