It IS a significant ruling and significant change, because abortion is no longer protected by federal decree. The decision is the correct one, as the Constitution itself states that any rights/restrictions not enumerated within the document are left to the states to decide. The recent ruling regarding the Second Amendment was a reminder that states cannot decide which parts of the Constitution they can ignore (through restrictions designed to get around it). This ruling is a reminder that the federal government must not use the Constitution as a way to expand its reach and power. It is long overdue.
I don't think the USA will survive as a democratic republic in the long run, because our system has been under constant assault from all sides, pretty much from the start. It is a credit to the founding fathers that it has held up as long as it has, but it's become clear in the last 40-50 years that there are now enough people willing to overturn it that it is only a matter of time. I'm hopeful that this doesn't happen in my lifetime, or that we learn enough in the next couple of decades to come to appreciate what we have and protect it. But I am not optimistic about that.