I'm not an expert on UPOV 91. I read a little bit about it, and I probably should know more. It gives them a little bit more extended patent rights, in terms of length. With the costs they incur and the development times, I don't think that's unreasonable. I think once it's off patent, they need to make those traits available to other plant-breeding organizations.
On February 14th, 2013. See this statement in context.