The Governor's order is not binding or actionable it simply advises local and city governments to clean up the camps. Some already have been after the Supreme court decision. If the local government was inclined to, they will. If they were not, they won't.
The way to prevent encampments is to bust them up constantly, keep these people moving use light and noise to prevent them from sleeping. It is easier to live off of petty theft and government handouts than getting clean and being productive in California. As long as that is the case this will be a problem.
I have said it in a hundred threads on here. This is not a housing problem. Even if we provided free housing with no strings attached there would be disease, rape, murder, and fires rampant wherever they were put and then we would be liable for that as well. The people who live in these camps are filthy and drug addled into insanity. They are not good people who fell on hard times, they are bad people who fell on easy times, we either stop coddling them or we just look on in horror as they multiply.
If you have never seen and smelled what hundreds of shuffling meth zombies living in close proximity is like then count yourself lucky.