Yeah, because what if we hear a talk like 'millions...' and tape it and years later they've found out they were wrong!
". . .resurrected in 1925 to rule as princes over the earth. (Millions Now Living Will Never Die, 1920, pp. 89-90) They failed to show up, of course, and Rutherford quit predicting dates. In fact, referring to that prophetic failure he later admitted, "I made an ass of myself." (The Watchtower, October 1, 1984, p. 24)"
Oops! ;-)