BTW: The MSRP for the base C8 is still closer to $60K than $50K. It might turn out that you won't be able to buy a brand new C8 for less than $50K for quite some time if not ever. GM could always raise the MSRP year over year and the MSRP for the base model might creep up to $65K. Even at the current launch price that is very close to $60K a 15% discount won't bring the car down to $50K.
Update: The first year of production for the C8 seems to be close to been sold out, that is close to 30K cars, most of them going for MSRP or more. So seriously doubt that you can get a brand new C8 for $50K.
Gen 1 NSX's NA1/NA2 are classic/collector cars for the most part, so comparing the prices on a car that is close to 30 years old to a modern car doesn't make sense IMHO. The NSX was hand built, all aluminum chassis, 3.0 engine with variable valve timing and engine control (VTEC) and many other goodies, it was a ground breaking car for it's time. The fact that it had great ergonomics, was reliable and easy to maintain just adds to the desirability of the car. The car had a lot of history during it's development
https://global.honda/heritage/episodes/1990thensx.html
Prices of the 1st gen NSX might come down or might remain stable or might go up, who knows. Depends on what kind of buyer is interested in a NA1/NA2 NSX. Honda loyalists or car collectors, or folks who just want to have the experience of owning one.