... not unless these blood thirsty comets and asteroids posses warp drive engines. So-called Planet nine has an orbit ranging from 200 AU to 1200 AU from the sun. Think in terms of THOUSANDS of years for comets to reach the inner solar system from those distances.
The average comet travels at 40km per second.
It could travel 200AU in roughly 23.7 years or 1500AU in 177.75 years.
While not thousands of years, it's still a long time.