Dude literally says we don't know what those consequences would be, but if doing away with policing as it is currently constituted is accompanied by a significant increase in resources to eliminate the causes of crime, why would you expect crime to go up unless you think everyone around you is secretly a monster whose base urges are only held in check by the threat of state violence?
He also contends that the issue isn't having some body to maintain order and enforce laws, but the nature of modern policing and society itself.
"Why has government been instituted at all? Because the passions of man will not conform to the dictates of reason and justice without constraint." - Alexander Hamilton
Not everyone is a monster obviously, the problem is there's still many jerks out there and that will never change, no matter how much you reduce poverty and increase mental health services etc. You can help reduce some of the causes of crime, like poverty, but you'll never eliminate all crime, ever. For every nice law-abiding person living in your neighbourhood you're going to have arse-hats too. If there's no cops enforcing speeding, what % of cars do you think would speed? Every time I see a cop on the highway I see every car around me slow down.
I've had wonderful neighbours in my life, and I've also had neighbours who acted like the scum of the earth with no respect for anyone, and it had nothing to do with poverty or mental health (though yes these problems do increase crime). We don't disband the military because we hope we can turn every world leader into an Obama by being nice to them, because the Hitler's and Putin's will take every inch you give them and only care about advancing their interests because they just don't care.
The idea of disbanding the police in favour of social programs etc is so illogical that it will never be done on a wide scale because it simply won't work. So it comes down to how can we make police the most accountable as possible and actually serve the public and honour their oaths. There will always be racists and power-mongers among the police no matter what, but we can minimize the damage they do via training and accountability etc so that they're not able to get away with it and lose their jobs or are put in jail.