If there are to be less police, then the ones that remain will really be working on meaningful things, like crime, rather than driving around wasting gas and harassing poor people. To reduce the burden on law enforcement, we should also legalize marijuana and prostitution.
I don't really know what to say to people that think marijuana needs to be illegal in 2016 and beyond. Read some books, get educated, try to advance in learning. Go to Norml.org and learn the facts rather than the old, disproved propaganda.
Prostitution is a more honest form of a trade that goes on anyway under various pretenses. People will always be attracted to money and to power, and nothing is going to change that. Sex for goods or services is as old as sex itself and is practiced in all the animals.
Also, have the mentally ill homeless people taken care of by a specially trained mental illness service. We should not call cops to deal with the mentally ill. Cops are not therapists, psychologists, or anything like that. Cops deal with crime. The mentally ill need help, usually in the form of anti-psychotic drugs or just rest and food. Some people additionally need guidance and advice.
Another thing we can do to reduce the burden on law enforcement is install a governor on all motor vehicles to prevent their traveling above 80 mph. That would reduce speeding using a simple technical device, which can be verified as functional by a cellular internet connection, without the need for cops. Using millions of cops simply to enforce speeding laws is inefficient. I really do not think that people go into law enforcement with the desire to hand out tickets to lead-foots.