Prester John and Abortive Civilizations

I reckon that the topic of survival of the Nestorian and Syriac Christian civilizations (if we are to use Toynbee's terminology) has been frequently raised on this board; still, what do you think are the chances of any of those civilizations continuing to exist much as Abyssinia did, pretty much isolated from the rest of Christendom but nevertheless able to withstand (or maybe get themselves restored after having been overrun) advances of Tamerlan, the Ottomans, the Persians etc.?

Georgia (a Greek Orthodox state granted) almost managed it in OTL; do you think it was possible for another Christian state ('Syriac-ized' Kurds, maybe?) to exist and to survive in the vicinity?
 
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