AHC: A world without Cyrus the Great

How different would the ancient world be without the rise of Cyrus the Great and the Achaemmead Empire? How would this affect the history of the Middle East, as well as the rest of the world? Would the Babylonians be able to win a war against Media? Could someone please make an ATL saga out of this idea?
 
This is as big a change as removing Genghis Khan, but with more than triple the time for butterflies to have an effect.
 
The problem with PODs that are so far back is that it's very difficult to make a TL on them. You can get some immediate effects, but not much further than that. I personally don't know enough about the time period to comment.
 
When I was first discovering what alternate history was, YEARS ago, I actually explored this exact premise...

... It turned into a Saïte Egypt wank, but Christianity and Islam still inexplicably existed... I was young! Don't judge me! :p
 
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