One thing that carries a real serious threat to the WT is the fact that most JWs in developed countries have email addresses.
You know how some send out general emails to all their freinds and when you get the email it has "all" the address on the top because the person sent that particular message to everyone all at once to save time. Think how dangereous that is to the WT, because when someone get to know the truth about the WT and becomes apostate they have all these email addresses that they can send information to to deprogram other JWs. This can really snowball in time.