Not every country has a spoil system, there's probably no need to change anyone in the institutions (except those very close to Vučić in dangerous positions)
Which is a double edged sword since then it's hard to get rid of the incompetent and corrupt people when they are deeply entrenched.
People appointed for their closeness to a party are not too likely to be competent and incorruptible
> party are not too likely to be competent and incorruptible
As I said, a doubled edged sword. A newly elected reformist government won't be very effective if they can't put new people in power.