Only if we didn’t learn from them.
Next step is to learn to live on the Moon using as much Lunar resources as possible. What we learn there will help us live on Mars.
NASA should also have a two part goal with asteroids. Part one is to learn how to use their resources for space exploration and settlement. Part two should be learning how to keep them from hitting the Earth. Perhaps potential impactors could be mined until there was nothing left to hit the Earth.