The silly thing imho is that the Cairo Museum - and its basement - is overflowing with masterpieces.
If you wander away from the areas the "guides" take you there's lots of "wonderful things" that most tourists don't see. Then there are magazines all over Egypt crammed full of stuff that in most cases hasn't been seen for decades, or longer. The new Grand Egyptian Museum when, or if, it's built won't eat into the undisplayed stuff very much and neither will the regional museums.
Things like the bust of Nefertiti are probably better known - and appreciated - through being prominent features of "foreign" collections than if they were in Cairo.
It's probably "heresy" but I sometimes think it would actually be sensible to sell off some of the duplicates and use the money to better protect and preserve the rest. There are umpteen European, American, Far Eastern collections that would pay good money for some of these.
John