Doubt that would even work when they have some sort of algorithm that allows for the random popups in each game (you notice that keys/arrows/apples are random and some games; you get more keys than other games)
Another reason it likely couldnt work is because most people join in premades in Survivor. So, say there is a way they can make it so only 2 idols appear each merge. Well, for the premades that are actually OP at challenges...It can make it nearly impossible for ANYONE to stop those tribe's as they could in theory STOCKPILE those said Idols. So, even if 1 or 2 Idols randomly popup each merge. The idea of super tribes stockpiling Idols makes me sick to my stomach lol
Not trying to knock on your idea because I have thought of this before. But, I also realized why Idols arent apart of a game that is never-ending due to the possible countless merges a user can get away with if they wind up on a OP tribe