As I noted in another string on this topic, the main issue with split boots is that you don't dissassemble, clean, and completely re-grease the joint. A new boot itself won't help correct potential mechanical/dirt/contaminants/fatigued grease issues within the joint.
As to the split boot itself, if applied correctly, I have personally installed some on front wheel drive cars that lasted well over 60,000 miles - longer than the damaged OEM boots they replaced! And front wheel drive places much more stress on the boot than an NSX.
The key is correct installation. The boot must be absolutely pristine clean when applying the adhesive/solvent. And it must not be moved at all, including do not move it off the lift or jack stands, for at least an hour. Shortcut those two steps, and indeed the boot is only a temporary fix.
So, if you are confident that no contaminants got into the joint and that the existing grease is in good condition, a split boot is a reasonable solution, IMHO.