They decide to ask what other colors people would like. So now Mars has really little choice. There is this problem. There is a myth that there is no blue food. In fact there are some.
Blueberries are blue.
There are some liqueurs that are blue. I think they look like Windex, but being a non-drinker nobody asks me. There are some foods made from blue liqueurs, like blue pancakes. The answer might be that the survey was flawed. But how could it be if it just asked people what other color they wanted.