I think Honda has invested enough time in making "exotic" concepts like the Dual Note and the HSC that its not going to be a big stretch for them to complete a next generation NSX. Granted the sales of the current model aren't spectacular (although they are way above what I think they should be for a 13 year old car), a new and improved model that can hang with the 911, Corvette, Viper, etc... will surely sell enough as a halo car to justify an investment in it.