But you need the "official" partner numbers to maintain the production ramp-up, and technically, nobody can say for sure that the Cloggies won't buy 48 more jets, or that the UK won't take another 90, until the production line closes.
On the other hand, if they do start seeing more FMS numbers outside the partnership, and don't need the UK and Netherlands orders as badly, they will point to their reduced offtake as they take work away from the Eurobacksliders and use it to lure new customers into the program.
For the record, by the way, "prediction is very difficult, especially when it concerns the future" and saying that the JSF program should be cancelled is not the same as saying that it will be cancelled. I have generally avoided the latter because I do not underestimate the power of inertia and human vanity.