It depends on what is meant by "serious investor".
If it means someone who takes investing seriously, many people look only at recent numbers. When investing in a stable company, like Berkshire Hathaway or Johnson & Johnson, those few numbers are all they need.
If it means an investor with serious money, in a position to buy all or part of SAS, those people are not fooled by two or three years of pretty numbers. They know it's easy to increase profits by reducing headcount. They won't believe that the people who left were "dead weight".
They'll look at past history and see that the company is not "stable"; it is shrinking. They'll estimate how many more years SAS can survive, and how much money they can extract over those years, and thus derive a value for the company.
That's what private equity does. That's what Broadcom does. That's the type of company that will eventually acquire SAS.
An IPO may bring more money than a private sale, if it attracts enough retail investors who only look at recent numbers. But the big money will look at the big picture.