If I was one of their shareholders, I would be happy instead, as they seem to have come out as the real good guys in the whole story (unless they were legally obligated for covering the mess).
If they begin to offer payroll services directly to some of the affected companies, I imagine the shareholders would be quite happy.
They might be out the money until the insurance pays up, but ongoing fees and goodwill could well cover that inside of a year or two.