Actually, I would say that the lack of any notable evolution of the car let to it being discontinued, not the exclusivity. Making a car for approximately 14 years, and only doing minor changes to the car is not the way to keep people buying it. If Honda/Acura had done what everyone else was doing and updated the car significantly with new models, the car may still be around today.
Using the example of the Corvette to keep this on topic, GM produced the Corvette in the C4, C5, AND C6 body styles during the NSXs production run. That is three TOTALLY NEW cars, while Honda/Acura let the NSX essentially go stale. That is why the NSX stopped being produced. No reason to spend $90k on a car when you could essentially get a super low mileage early car for $35k - $45k, spend a little money to convert the front end (if you wanted to), and have essentially the same car for the most part at half the price. If Honda/Acura had kept up by doing things like total car redesigns, and moved the power up with the pack to be in the 400 hp - 500 hp range, used some of their new technology like SH-AWD, I believe it would still be in showrooms competing with car like the Nissan GT-R, Porsche 911, and other sports cars of that caliber.