As a taxpayer, I'd probably be disappointed if the government ended up being responsible for that. Let's face it: when we consider the ones that are already out there, the ones that have been used by innocent farmers for 15 years, we're not going to go back and make them responsible for that loss.
However, we have the future to think about. If there's a new product on the horizon that's going to multiply this problem, we can stop it. That's the first and most sensible thing to do.
In addition, I think that the provider of the seed has to be partially responsible at some point, along with the person who buys the seed and grows it. They'll take precautions against that kind of economic impact on their neighbours if there's a possibility that they'll be held responsible, but we need regulatory changes to put that in place.