I agree with the possibility you've described although, I disagree with the key takeaway from it.

Your post takes away: There is an RSI-enabled AGI possible that progresses gradually before reaching a point of rapid takeoff.

What I think is more important: There is a strict lower limit on how fast we take off now, because even the current loop of RLVR with non-AGI strength models is already AGI. That takeoff is inevitable.