They need a leader. Now they have no one to follow.
The interesting thing is that Wagner had a fairly flexible sort of organization with Prigozhin and a few people at the top, then a lot of “commanders” with substantial independence.
Prigozhin’s own attitude was said to be (by Lukashenko) “To hell with it, if I die, I die”. What I don’t know is how the “horizontal” communications and cooperation might now work.