I think it is more practical to the normal human being that doesn't know much about dimensions/realms to realize that there is life out there and now we have factual evidence that there is. It will be easier to understand to the overall populas of this world to know that life exists not only on Earth, but anywhere else in the universe. I believe it may be a little far fetched for NASA to begin to explain these non everyday terms to unsciencebased people. Maybe this could happen once an overall good understanding of the universe is understood, but as of right now I think this is a step in the right direction and the beginning of more and more people believing in the coloniztion of space.
One day if we ever start to populate places such as the moon/mars/etc, then we can begin to understand in what you are trying to explain. But as for the everyday folk, I could almost assure you that this will bring abrupt changes in the way people think of space. To realize that we are not alone is intriguing to some and startling to others, but there will many feelings changed just from finding a minuscule lifeform some 800 million miles away.
I will be listening for such announcements. But even if we find that there is habitable life on other planets or moons with the same basic elements, microbes and bacteria of our own earth, it does not really determine anything.
It may not determine anything to scientists or people that do this type of research everyday, but as I said above, the important thing is that this will fascinate some. This may get the ball rolling for more people/kids to take the route of astronmer/scientist/etc. This will change what 6-8 year olds learn in elementary school, they will not have to imagine ET life anymore, they will experience it as a reality.
So I don't agree with you that it does not determine anything. Scientifically, it may not determine much but there are a lot more everyday people than there are scientists last time I checked. It actually may not surprise you or stimulate your thoughts, but that doesn't mean this won't begin to make everyone "Believe" in something more than what we have here on Earth. And that alone will be the most important part of this discovery..