I wouldn't even say that 1914 was a lucky guess. Russell identified lots of dates and so did Watchtower writers after him. The fact is every decade has at least one defining moment so predicting something special isn't hard even Russell hedged his bets with 1915.
1929, 1933, 1939, 1941, 1945, 1957, 1961, 1969, are some notable years in human history for one reason or another but you could add lots of other years for other reasons too. If the world changed in 1914 did it change again in 2001?
Thirdson