It's too bad that they didn't agree to accept the 586BC date. Imagine- they first use the 607BC date and come up with 1914 and BAM! World War 1! Then they recognize the error and go with 586BC and BAM! the early 1930s and the rise of Hitler! They could then say that God was cleverly showing them when the events leading to the crowning of Jesus in 1935 began.
They would not have had to come up with that overlapping generations crap for at least another few years from now. Missed opportunity!