I still think there's a market for the product for older/used/classic vehicles, but wondering what your perspective is on this.
The bottom line is it's generally 40 years from the point when features like seat belts, air bags, traction control, and backup cameras are first introduced and when they reach 95% saturation.
Throughout this adoption process, demand for these features among those whose cars don't have them increases significantly!
Your customer base consists almost exclusively of those who are both willing to spend $499 on an accessory and who don't already have a reverse cam. Many potential customers won't have an OBD port in their car because OBD-I wasn't around until the '90s. Muscle car enthusiasts and parents (happy to spend $499 to prevent an accident) passing down an older car come to mind.
It would be great to see a second generation version that works without OBD.