Gatchaman's development will probably be looked at and re-evaluated. If it looks like there's no market for it, they may scrap future productions. But if it falls within a certain forecast, then they may decide to carry through but change it's treatment. It's a risk they gamble with. It may have all the praise and support during production, but when it gets to the public, the public may say otherwise.
And if Robotech gets steamrolled in the box office, it will all be due to Robotech.
Again, it's a gamble. It can go either way once it comes to the general audience.