That was the plan, but is not the reality. The Ag companies are producing new varieties to be used with even more toxic pesticides (yea, I want elements of Agent Orange sprayed on my food - NOT!) because the current varieties are creating problems with superweeds.I believe GMOs are detrimental to my family's health and my bird's health too, and I choose to avoid them. And most mass produced commercial feeds are full of GMO grains as they are cheaper and more readily available (for now) than organic and/or conventional grains.
Believe whatever you want - the science says otherwise.
GMOs are more prevalent because they grow better, cost less to grow, and use less fertilizer and pesticides. They're a very useful tool in the farmer's toolbelt.