Stocks market trend is always in a wave. Whenever it waves down, it would waves up again in time to come. It won't stay high forever, neither would it stays low forever. Bull market would not be forever. Any speculation would easily bring it down to a bear  market. However,  this does not necessarily reflect the true value of a company can be doing very well. We do not quit from our jobs just because our company shares has fallen. If you are an employee working in a good company, you would just continue to work there regardless the shares price goes up or down. I believe the S&P 500 would not be sink into the bear market. It might takes a few months before it comes back to be in bull charge due to the fear of raising interest rate now which speculates that the economy is going into recession soon.