Stone, I don't think it would be as crucial with Ferrania or New55 as it was to Impossible. With New55, they're dealing with essentially B&W film with a developer pod. Ferrania has all their old machinery and formulations, and it's just a matter of reconfiguring everything. Impossible only had the machinery and not the chemistry, so they've had to research and developing everything from nothing. The "beta test" phase was thus much more important.
While I'm completely ecstatic that Impossible happened, I'm not personally a Polaroid lover, especially not the integral film. (I grew up with a white rainbow Polaroid One-Step and hated it even then!) Sure, the early Impossible films aren't for everyone, but they're for people who enjoy tinkering with not-ready-for-prime-time formulations and the eccentricities they offered. I understand their product is much better now and approaching the level of quality from the real Polaroid films, even if the image takes longer to develop.