What Value the C Series Now?

AirBus looked at it and saw that with its marketing muscle and everything that Airbus could bring to the table and considering that it might sell thousands of these planes in the future, AirBus was it was willing to pay umm less than nothing for half the C series (They got options on 5% of the rest of Bombardier thrown in for free in exchange for paying nothing). 

Oh and Bombardier has to cover the losses for the next two years. What does all this tell you about the value of Bombardier's remaining 31% share? There are going to be some interesting discussions about what value this can be shown at on Bombardier's balance sheet ( I suspect a write off to zero is imminent)