I would say police abuse does appear to be a serious problem and lawsuits are probably the main thing that keep it in check. The departments themselves don't seem to deal with offending officers properly very often. It always pains me to see settlements and the offending officers returning to duty with little repercussion.
Bonding seems like a reasonable solution. If each individual's bonding risk showed up as cost to a PD, there would probably be a sudden interest in body cams and training on how to deescalate situations.
Interesting article.