Why Did The Khopesh Go Out Of Style?

[Exarch]

if that's the right term for it.

This is a khopesh, famously used by egyptians:

Spoiler Alert, click show to read: 

Source: http://en.wikipedia.org/wiki/Khopesh

so why do we not see anything similar to this in later successor empires and kingdoms?

or any of the weapons the ancient egyptians used, like the massive sickle hammer?

[athanaric]

Boring standard answer: Because it got replaced by more efficient weapons.

[neoptolemos]

To my understanding it has been replaced from more efficient types of slashing swords or the use of iron instead of bronze made the construction of this shape impreactical