Firstly, I'm not sure how you 'throw capacity', but that aside, the more pertinent question might be what (a) the economics of shipping waste to Germany and disposing it there look like vs. holding it in Poland and dealing with it over time, and (b) what the politics of the matter are, as I would expect lobbying to go both ways (clean it up quickly, no matter the cost and whether with German capacity or not vs. 'we should not be sending money to Germany and can do this with Polish companies').
That might be a better way to come to a reasoned estimate of the competitive threat German capacity may pose for the thesis?