I am not likely to find out first-hand what the reactions of the householders will be, since I no longer peddle religion from door to door.
However, it is human nature to reject beliefs and attitudes that conflict with your own. This rejection is not necessarily done in a spirit of violence or meanness. Therefore it is likely that the reaction will be nothing more than a firmer resolve of the general public not to have anything to do with that kooky religion known as Jehovahs Witnesses. If the public perception is that JWs value their reputation over the safety of children by hiding child molesters then their message will be rejected, probably without even mentioning the issue.
There are many reasons why I wouldnt become a Mormon (for example), but I wouldnt engage in a lengthy discussion as to my reasons on the doorstep. I wouldnt see the need; I would just persist in saying no thanks.
So, IMHO, thats what Dateline will do cause a steady decline in the number of people prepared to discuss the JW religion.