Earlier quoted context omitted.
if even a small percent of people become anti GMO, then GMOs will die out Not if they are a measurably better product the won't. If GMOs can offer food that is significantly tastier and/or significantly cheaper then they will do just fine. I'm not a big fan of GMOs per se. but offer me something I actually want and I'll happily buy your product
I think the problem here is one level of abstraction further out. It's not whether anti-GMO types can keep you and I from buying GMO products -- indeed, it's unlikely that GMOs are going to have much to offer western middle class consumers. The big kicker is the effect this battle have in the third world, where GMOs hold the potential of a much larger impact (see eg https://en.wikipedia.org/wiki/Golden_rice ).
To be clear, there is nothing wrong with manufacturers selectively labeling their supply chain methods. There is a problem with forcing them all to, when there is no evidence to support it. Even with nutritional labels, consumers have a right to know what is in the good for making decisions based on health reasons.