I don't think we need to worry about cancellations of the Batman & Robin figures, or about any potential Burton/Schumacher figure releases HT may have in the pipeline.
I'm confident the B&R figures will be fine, especially with the huge resurgence of Burton/Schumacher merch at the moment. It kinda feels like the more merch comes out, the more hype for those original movies builds up. Then the more people want that merch. Just look at the McFarlane B&R wave of figures. They sold out fast, and sell for crazy prices on the aftermarket.
I think possibly the problem with this Batmissile is, that although it's cool, it's just nowhere near as iconic as the Batmobile, or the characters from the films. And it only appeared for a minute. So it's a harder sell in big numbers. And the fact they're cancelling this so soon after it went up, suggests the preorder numbers were bad from the start.