Ur projecting, if turkey really wants to hurt Egypt (which is a possibility depending on the outcome of Libya and east med) turkey would actively encourage construction companies to Ethiopia to build more dams and there wont be anything u egyptians could do about it
it will be nasty to face Turkey with all these upcoming naval modernization, missile modernization, army modernization in the north, the iranians (since ur so keen to protect the GCC pets) in the east, the distrustful maghreb states in the west and most importantly in the mid term the Ethiopians who see the Renaissance dam as the key pillar to bring their country forward. You shouldn't have tried to lock Turkey in the Mediterranean while Turkey was busy dealing with the US,Iran,Russia and the whole global coalition in Syria and with that conflict nearing its end turkeys hand are also getting more flexible. Turkish troops will land and the assault of Haftar will be stopped, one way another.