I knew you were going to talk about Mr. Smith's point of view.
In reality, your answer would leave the most humble researchers stunned. It is not the quantity that matters, but rather the need to ensure that all categories of the population will be represented. In a survey, we want to be able to see trends such as when a barely visible minority finally expands. That is the most valuable part.
With the way things are right now, we cannot detect a pattern emerging regarding a barely visible minority that is becoming increasingly significant. That is what we want to examine to be able to make predictions.