De Blasio is in exactly the same position.
"Progressive" leaders cannot survive without obedient security forces. The police union has demonstrated that the forces under their control are no longer reliably obedient to the elected political leader.
Neither side can survive if the other side remains in power.
This cannot end well - for participants or spectators.
The trouble is that as far as de Blasio is concerned, “the die is cast”(*), and there is no way he can redeem himself to the police. And he is unwilling to try. His attitude is more “Let them hate me, so long as they fear me.”(**)
So who wins in a fight of 34,000 to 1? Even if he were to bribe or threaten the union leadership into obedience, the rank and file “are their own men”.
(*) Attributed to Julius Caesar
(**) Attributed to Caligula
While it is unlikely that de Blasio might meet his end like Julius Caesar, stabbed by some aldermen on the steps of the New York City Hall; he may instead find his end like Caligula, while passing through a tunnel on the way to some sporting event, betrayed by his own Praetorian Guard.