Except for arbitrary cultural conditioning, there’s really nothing wrong with eating bugs. People who live in the forest eat bugs all the time. At industrial scale I could well believe that bugs would be a better food source than some of our current staples, and if bugs were cheaply available and other foods had all of their external costs priced in, I could imagine substantial numbers of city dwellers choosing to eat bugs. (Which is not to say that anyone should be forced to eat any particular food.)