If the WT said that today people who just didn't know enough would make it, then it would be better to keep them ignorant by not going to their doors.
Moreover, JWs would be in a worse position than a completely ignorant person next door because JWs might prove unworthy and not make it.
Can't have any of that.
So the WT must have it that only JWs will make it.
That not only makes it essential to be a JW, but it heightens the urgency for JWs to witness to as many people as possible so as not to incur bloodguilt.
Fear! Guilt!Do more! Do more!! Do more!!!