False equivalency; Airbus has a product in direct competition with the 787; Boeing has nothing on offer in the CS-size. Another analogy which hold more water, would be if the Canadian government bought 49% of the Dash-8 program, then offered Q400s at dumping price in competition with ATR-72s.
The result would, I suppose, be along the lines of lodging a complaint against Canada in the WTO, let the lawyers collect millions for a couple of years, before being allowed to slap a toll on e.g. Maple syrup, timber or tar sand oil. But it is highly unlikely to be in the +200% bracket, maybe a quarter of that, probably even less.