I feel that this is exactly why we need the impact assessment, why we really need to look at it. I can point at risks. I cannot give definitive answers here. Scientists actually are the last ones one should ask for a definite answer to anything. They're constantly on the search for truth.
I feel that there is a risk, yes, definitely, that farmers could lose their own varieties if they grow their fields too close to a GURT crop. But then again, there are implications that need to be assessed. If there is the understanding that farmers should have the right to keep their seeds, if that is the understanding, well, then you need to look further into this problem. If the understanding is that farmers should not, that it's not a right, then you don't have a problem if the farmer can't save the seed.
Do you see what I mean? This is something I feel society, politicians, and farmers should come together on and ask if that's a risk you want to take, if that's where you want to go.