Nowadays if a new type of restaurant succeeds then a dozen more are started just like it and spread across the country with debt financing.
It becomes a game of chicken to see which will last. There was the roasted chicken craze, then the luxury burger craze, then the sub craze, then the spicy chicken craze, now the chicken nugget craze.
In the long run only the lawyers and accountants end up in the black.
McDonalds bought Boston Market and then dumped it.
McDonald’s made it because they never change.