I mean, short of calling this a "Titan A" and leaving NVLink + full hashrate present or something of the sort, I don't think there's any space left in the GeForce stack or any logical business reasoning behind a 3090 Super. There is a limit to what the market is prepared to spend, even in these troubled times, even the richest guys out there don't exactly fancy throwing money in a fire pit, even at the height of scalped pricing, the 3090 never really exceeded the Titan V's MSRP, while still being a much faster and advanced processor than that not-so-old Volta behemoth.
Besides, TPU benchmark data shows the 3080 Ti performs 99.5% of the 3090 already, and having one I can tell you that unless you have a model that can draw well above 600W, you can't quantify any meaningful performance increase beyond closing the gap between the shipped and the rated memory speed with one.
The honest truth that may make many NVIDIA fans sad is that this eventual card would never achieve what it would set out to do: make Ampere retain the crown in any titles where the 6900 XT beats the 3090, in those, AMD's performance advantage overcomes anything that's left in any GA102 type at any clock speed, feasible for 24/7 usage or not.