You can almost predict that somebody holding Precheck clearance is going to pull a terrorist act on board an airplane, can’t you?
I won’t predict anything until I see what the TSA requirements for enrollment will be.
If you are a US citizen or have been a permanent resident for some number of years, and have a clean criminal record, I don’t foresee any additional risk.
Keep in mind that people cleared for PreCheck basically go through the same security screening as before 9/11. They also randomly check for explosive residue.