What if: 4th Crusade goes where its supposed to go

So what would of happened if the 4th Crusade never was diverted against Byzantium and they attack Jerusalem through Egypt like the original plan?
Would Byzantium of survived?
Would the fall of been delayed?
 
So what would of happened if the 4th Crusade never was diverted against Byzantium and they attack Jerusalem through Egypt like the original plan?
Would Byzantium of survived?
Would the fall of been delayed?

Possibly no fall.The ERE might actually regain the entirety of Anatolia if the Seljuks fragment like otl.
 
It's not going to work.

I mean when you think about it the entire First Crusade wasn't supposed to work either, but Egypt is actually really hard to invade from sea or land.
 
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