The original intention of the theocracies was that they would at times war eachother, absorb, break apart and repeat. What instead has happened is stagnation and locked alliances that are killing what you love so much. Just because the theocracies fight doesnt mean SA dies. At the rate you are goong with noble attrition both your realms and religion will kill themselves off without any of us having to do a thing. 
Thats the dumbest thing I have heard in awhile. The theocracies are weakening but they are far from falling apart due to loss of nobles and SA as a religion has more nobles than ever afaik.
