Clearly, the answer is that police departments are filling roles they do not need to fill, and have expensive, military style equipment they do not need to have. I hope we see more cities bringing these ideas to the table.
The disband crowd still wants people patrolling and available to deal with emergencies, but generally wants them to be specialized, unarmed, and focused on peace rather than violence. Ensure we have mental health specialists on call, dedicated people focused on addressing the homeless community, etc. Yes, we'll need a few folks who are trained to use force, but that shouldn't be the normal mode of police.