It was a modern church building. It had little historical value. I cannot judge its aesthetic value because it is not in the architectural tradition that I understand. Of course it can be rebuilt, the building, that is, can be rebuilt.
But it was a living church: there were people worshipping inside, babies were heard, singing was heard, prayers. Will that be rebuilt? Can it be?
I am afraid that the loss of Christian population and Christian life in the Middle East is irreversible.
Actually the modern Church building is still there—ISIS just removed the crosses (and did who know what other vandalism).
The ancient tomb is what was destroyed—with much historical value. Fanatical Muslims seem to hate tombs, for some reason. They destroyed the biblical prophet Jonah’s tomb in Nineveh too.
Back in the 1920s fanatical Muslims in Saudi Arabia destroyed the tombs of Mohammed’s relatives too....and of course a Caliph in the AD 1000s tried to destroy Jesus’ tomb (empty though it is...) in Jerusalem.
Probably not YOUR lifetime, but in the long run? The good Lord knows and we can trust in Him.