I never worry about Jon packing up and leaving. To me he seems as though every product he makes he is more dedicated and always looking to improve. Also he just opened his store so you know he will be around for a long time.
I think he has a son too, make he will train him to be as good or maybe better than him!
Lastly it's not like Jon charges thousands of dollars for his products, that are well priced. So even if he did for some reason retire, it shouldn't be a heart breaker.
I love naiant and I wouldn't put my mics though anything and be as happy as I am.
And I'm sorry I can't really answer much about the real answer but I wanted to say what was on my mind.