On the whole this could be a very successful strategy for producing more food at a lower environmental cost. However, a serious danger exists, which people are largely unaware of. Those who object to GEFV's do so largely on the basis of unsubstantiated fears that they will cause direct health damage to humans. This fear is due largely to ignorance. The technology of gene splicing is not different in principle from methods used for centuries by plant breeders.
Modern methods are simply faster.
But, while the potential health threats to humans are extremely minimal, there is a very high likelihood that plants containing their own natural pesticides will contribute to the creation of even more destructive pests in the long run. The mechanism for this is simple. All except a few, that is. For, in any given population there will always be some bugs that are immune or resistant to the pesticide. The few surviving pest-resistant bugs will mate.