Same as the position of SoIA cannot stay filled for more than a couple months, the position of GM cannot, either. That is completely irrelevant for whom to choose to do the job.
Even if you give it to the SoIA, the GM still has effective control over it because he/she can ultimately render null and void any and all stories and decisions made by the SoIA/SoEA. Why bother? All I can say is that if I were GM and this were to go through, that's exactly what I would do and I would maintain full control over monetary policy. And there isn't a scenario in the world in which this body has direct control over such a matter and it actually turns out well.
Well of course no on will hinder the GM from it; and this is good - finally something to do for both of them, finally something happening for those two guys.
I echo your comments that the Senate should please keep its fingers off monetary policy in the game, though.
Historically, the GM position tends to be a bit more stable than that of SoIA/SoEA. All posturing aside, I fear that if we literally make the position of GM weaker than that of SoIA (excluding the blanket "I void your action" power that could really set a bad precedent and that would make people have conniption fits if used consistently), then it's going to become even harder. I've always maintained that the SoIA/SoEA positions need to be abolished - not given more power - as they have generally been abject failures (the same cannot be said about the GM role), and that the GM should be allowed to appoint deputies as necessary to fulfill these in-game needs.
I can obviously not comment on the historical stableness of the GM position, but you have to agree that in the year I have been part of Atlasia, we have had a vacancy in the GM position about as often as we did have one. Obviously, that is not deemed to be so forever, but in my personal experience, there has been little difference between the successes of GM and SoIA, respectively.
I agree, the proposal of abolishing SoIA/SoEA as "storytellers" and have those powers to the GM certainly has its benefits. I do believe however also, that if we stay at the current model, it certainly is not worst to give the cabinet positions a detailed job "description", if you want so, with specific powers designated for them.