Note the problem on biosafety is more that good GMOs will be banned because they'd spread pesticide resistance to weeds without terminator tech, not that they will be introduced illegitimately and spread pesticide resistant genes to weeds.

How exactly would pesticide resistant genes transfer to weeds? Unless the your GMO plant interbreeds with weeds, witch is not very likely based on the fact that you do not often stumble upon tomato-dandelions (if I'm terribly misinformed here please tell me). And horizontal gene transfer, have not been observed to any large extent in multicellular organisms.