That is exactly true JoeDoe! IF Kreia destroyed the force then all of the galaxies inhabitants would be like the Jedi on the Star Forge that Malak captured and didn't "let them become one with the force". "For all purposes and intentions they are dead".
About the Vong part, we don't exactly know if they even existed in the Old Republic era. They were located in an entirely different galaxy, and might not even know what the force is. So if they came into, what we call known space, there would be nothing if the force was destroyed.