I wonder although I don't know whether the 960 has been permanently shelved, particularly with the RSR being mid engined and therefore the raison d'etre of the 960 has diminished.
I was under the impression the reason for being of the 960 wasn't to homologate for racing (i actually think the 911 needs to continue racing, given it's heritage,) but to fill out the product lineup.
There's no question Lambo, Ferrari and Mclaren are making hay in the above $250k (with options) segment. Porsche has nothing between the 918 and the 911.
Sure, special cars like the GT2RS may edge into, if not even eclipse Huracan/488/650S performance, and nibble at the price. BUT there's always going to be people who won't be able to get around paying $300k for "just" a 911, especially when the base car at 1/3rd the price is fundamentally the same car.
Having a bespoke model in that segment will be greenfield for Porsche IMO.
If they could do it with Cayenne... then philosophically at least, this is much easier. (there's also the matter of modular platforms being shared across VAG, so whatever Audi and Lambo are using for the R8/Huracan could easily be Porsche-fied for an all new contender from Stuttgart.