So how will they solve it?
Having researched the whole 607BCE thing, it's clear that it's utter nonsense. For example, the House of Egibi transaction records closes the door on any questions about the reign of kings of this time. At some point, given the information age that we live in, the WTS will have to capitulate. But how can they do it and keep the Org together?
Here's my theory (dear WT Writing Commitee helpers - please feel free to use cos I reckon it's a good 'un):
They drop 607 BCE and agree it was 586 BCE. The '70 years' then becomes like Tyre's 70 years and refers to 'the period of Babylonia’s greatest domination' http://wol.jw.org/en/wol/pc/r1/lp-e/1200275991/23/0.
The return is shifted to 538 BCE rather than 537 BCE, solving any controversies with what most historians think.
So that means the 2,520 years guff (prophecy I mean), then runs to Oct 1913 CE.
What - no good? Oh yes it is, for two brilliant reasons.
Great Reason #1. As JW Facts and others highlight, WW1 was already chugging along nicely by Oct 1914, therefore Team Satan were a tad late for the party. By shifting to Oct 1913 CE, you then can neatly tie it in with the end of the Balkan Wars (last treaty was signed on 29 September 1913 http://en.wikipedia.org/wiki/Treaty_of_Constantinople_%281913%29 ) which many historians site as the forerunner of WW1. Thus Team Satan role up in Oct 1913 and starting brewing up problems on Earth.
Great Reason #2...if the WTS is thinking that the witnessing work ties in with Noah's 120 years preaching the that would be 1913 CE-2033 CE. So the 1,000 years reign of peace would neatly tie in to the 2,000th anniversary of the death of Christ.
Good huh?
Move over Franz, there's a new kid in town...