I can see that helping in the sense of holding police responsible once they have taken bad actions but I am not sure if that will help with power seeking actions.
As an aside, we should remove liability protections for all government officials not just police.
Making bad actions visible can better inform voters and increase accountability (even if it doesn't remove bad actors themselves from the system). Qualified immunity is useful and helpful for the justice system in theory, but it is increasingly clear it causes more harm than good.
As an aside, we should remove liability protections for all government officials not just police.