a combined tax and subsidy to try to drive farmers into more sustainable practices in a fiscally neutral way isn't a bad idea, but I think it is just a very risky and necessary roll of the dice.
I think inevitably, there will be price increases. The questions is just how bad and how many farms survive the transition.
You misunderstand, driving small farms out of businness so they can be taken over by Gates and other big farming monopolies is the real goal not an unwanted side effect.
a casual American perspective here -- it is easy to mistake the cause when an effect is obvious. Yes, coordinated market regulation ends up increasing consolidation (with capital). Not everyone thinks this is a bad thing. No, it is not a plot by a few powerful individuals (easy to imagine, convenient emotional target). Rather there are "policy levers" and economic forces that operate at once, and interact in complicated ways.