If you're saying it's a market decision, then the market will work it out, right?
On the other hand, if you're saying we need to pass regulations to label everything that a few outspoken, science-illiterate, talk show hosts and bloggers say we need to be afraid of, then that's where we have a problem.
It's not like a label "Contains Asbestos" that would signify a clear ingredient with a clear health disadvantage. Putting "GMO" on food would just confuse people even more since they won't know what sort of GMO is in it. It could be one that makes the food less healthy or it could be one that helps stop cancer.
Forcing food to be labeled by the FDA should only be done if there's a scientific reason to do so.