I think they plan to use fear instead.
I doubt if they actually sat down as a group and said...."OK fellas, we've got to get these people under control. We saw what happened when we used a specific date, so why don't we trick them to doing what we say by scaring them into it".
However I do think JW leaders really believe what they are preaching and don't think they are trying to trick anyone but instead have become officious about the role they are playing. When people are acting in an official capacity they often start out being eager to help others but somewhere along the line out of a misguided sense of duty, they stop being themselves and start coming up with complicated policies and unnecessary and unwanted ways to control the same people they were trying to help.
The original Bible Students met and studied the Bible and published a Magazine. The next thing you know, people are writing to them in New York and asking for scriptural advice and clarification. Eventually they had a following and began thinking of themselves as having real authority. It took on a life of it's own until decades later they believe that they have the responsibility to intervene in and govern everyone's personal relationship with God and the members personal lives by any means necessary.
I think they really believe what is being said in these " creepy videos" and that they are necessary but instead of simply teaching people what the Bible says and letting them act accordingly as they see fit, they believe they need to control them and force the desired outcome.