I see no reason it would be impossible to expand the chain greatly while still maintaining the quality.
But they would have to maintain private ownership while opening additional packing plants, keep the high comparative wages for employees, and all the other things that allowed them to build to where they are today. IMHO, this just isn't possible in a standard fast food franchise setup.
However, whoever owns the company could make a lot of money very quickly by going public, franchising and letting the quality go to hell. Here's hoping whoever is in control isn't thinking only about dollars in their pocket.
This is, BTW, one of the drawbacks of capitalism. Somebody can almost always make a lot of money by cheapening a superior product. It takes the market a while to catch on and during the lag you can get very, very rich.
The young heir, a girl that appears to be in her 20s, has the idea to expand. I hope there is a lot of thought before eroding their quality.
That's what worries me. :(