You don't seem very bright. I'll give you one example how "small" things can destroy entire ecosystems: the present problem the world is having with bees. With bees decline pollination becomes a problem. With so many flora depending on it, that becomes a problem since many other beings depend on that ecosystem, and so on and so forth. Hence Australia has so many restrictions to animal and flora imports.
Although such scenario is unlikely it is not by any means impossible or implausible.
And regarding NASA, did you notice that the problem started more than a decade before? They had plenty of time to prepare and a lot of less people to think about since it's implied throughout the movie that in the early signs of the blight countries went on a cleansing to try to reduce the worlds population (Professor Brand even says he refused to do so himself when ordered). And the building itself wasn't a construction yard or assembly line or launch ramp, it was the vessel itself. Problem is, it can't be jet propulsion or any type of fuel, it has to be gravity itself that makes it lift off and propel. Hence the need to solve the physics behind it and why the data from the black hole are so important.
And making earth habitable? Sure, if we disregard the first paragraph and they haven't tried it already. It's easier to get artificial gravity (even by not so "advanced" means like a centrifugal force on a space station spinning around its axis) than to terraform or "re engineer" the planet. But that's not what they are after.
They can't save the planet, and they can't create and launch space stations suitable for life, they need gravity (to lift off, to propel, to maintain atmosphere so much needed for life, keep in mind that we know how to provide artificial gravity - in theory, we have never studied long term effects and to minimize Coriolis Effect the ISS would have to be way bigger, plus it would need lots of energy to start it spinning or stop it - but we still need to restock the space station, from Earth, once in a while), so they have plan A: solve the physics behind manipulating gravity. There's also plan B, a genetic ark to repopulate a suitable planet if plan A is a no-go.
There's a lot of things you could pick on the movie for, but not one of those you mention are it.
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