My friend,our concept of 'caliph' is misleading.
Caliph in islam is the 'Avatar' of Allah.
Or the 'Autaar' .
He is a wali ullah who has no will of his own and his will and Allah's will have become the same...
For him all the humanity praising him or condemning him are the same.
Not somebody who is hungry for pieer,praise and wealth.
True my brother. But there is a hadith too that Caliphate would be back again.