My recent thought was along these lines: We don't need GMO labeling. Since there is a market for non-GMO (even if it's only the equivalent of someone who wants their product de-demonized by a voodoo skypilot), any product that can make that claim will. Any product without the label can be assumed to be GMO.
The status quo lets the fact of GMO matter to those to whom it matters, without stigmatizing GMO products.
In Europe at least, this is not true. You can pretty much go shopping and assume you will not get any GM food, unless you buy processed food or other things that are likely to be shipped around the world (dried corn kernels, rape seed oil I can think of, not many others that I am likely to buy).