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The FE cards are about the ONLY ones that would fit surely? Except the 3090, all the FE cards tend to be the smallest in there class.
I mean even the 3080Ti is strictly 2-slot.
Not sure any of the 30-sieres AIB cards are 2-slotters? (All tend to be at least 2ish right? or 2.5... so cant actually fit a card directly below)
And yea.... if nVidia DID go the route of FEs only.... people would just need to lump it. They could fit an aftermarket cooler maybe to fit a really specific case?
The size is fine, but the fan design just doesn't work in many small form factor cases. For example in my case one of the fans of the FE would be directly exhausting onto a metal plate with about 5mm distance between them. Very quickly becomes a hotbox. The FE design for the 20 series would be fine, though.