There's a difference between (a) being a sports car and (b) performing on the track. They are not necessarily the same thing.
A sports car is a category of car. Most folks would agree that it is a car that is designed for high performance. Many would argue that the term should only apply to cars with two doors and two seats. Some would also argue that the term should only apply to convertibles (open top cars). Depending on how you define a sports car, a '91-94 NSX coupe (not a convertible) might or might not be a sports car; a '97-01 NSX-T (not exactly a convertible) might or might not be a sports car; a new 911 Turbo (with its tiny rear seat) might or might not be a sports car; a new M5 (four doors, four seats) might or might not be a sports car; etc. This is all a matter of semantics; state your favorite definition of the term and you can see whether a given car fits.
However, there are cars that might not fit a given definition for a sports car but still perform on the track. At the track, a four-door, four-passenger M5 can perform quite well, but it is not exactly nimble, due to its 4000 pound curb weight. A new two-door four-passenger E46 M3 can perform even better on the track; some might claim it is a sports car, but others might not, due to its rear seat. The previous generation E36 M3 had a four door version for a while, and again, it might or might not be considered a sports car, but most folks would say that it could perform on the track just fine.
I don't know whether there will be a next generation NSX. If there is, I don't know if it will have hybrid technology or not. I don't know if folks will consider it a sports car or not. I don't know if it will perform on the track or not. When it's introduced, we will know all the answers. Until then, it's all conjecture. Guessing is fun, but that's all it is.