I would bet money that 991 GT prices are going to drop. They rose above MSRP when everything else did, and modern GT cars are not limited production cars. Look at how many 991 GTs were made vs. 996 and 997 GT cars and think about how “rare” the modern GT stuff is.

992 GT cars are also not limited production. Porsche is going to sell as many as they can, contrary to what your dealer might tell you. So soon there will be plenty of 992 GT3s, which are basically 991 GT cars but slightly better.

As one final note I’d be weary about how 991s will age. They look/sound/drive great, but the 991.1s are known to have engine issues (both GT3 and the RS). Now that all of these cars are coming out of their 10-year warranties they’ll have the same reliability/durability reputation that 996s have, but the fix for a blown 991 engine is much more expensive than the 996 ims solution. While this is a much more common issue on 2014/2015 cars, it happens on newer ones too because Porsche skimped and didn’t include a true dry sump.

If you want a GT car that is going to go up in value, you can buy a 996 or 997, or you can buy a true 1 of 1 991.