One glaring issue I see, is the 12 years part. And I don't mean in the simple banging-head-against-wall versus know-when-to-quit sense. Even if the sunk cost wa

One glaring issue I see, is the 12 years part. And I don't mean in the simple banging-head-against-wall versus know-when-to-quit sense. Even if the sunk cost was zero, once decades start passing, even the slowest and most bureaucratic dinosaur will be able to catch up with you. In my opinion he needed to move on to some new adjacent product or aspect of the market where he could have an advantage again. Not just piling on features that those competitors could do too.