Now those membership changes have come back to haunt us. It would be self-defeating to sell your stocks and stock funds at today's prices, then wait to get back in until after the market proves itself by going higher than today's levels. By selling low and buying high, you'd be doing things backward. You might plan on selling now and then buying after prices go even lower. This may be a time, then, when it doesn't pay to think about it too much.
Stocks are long-term investments.
Perhaps it's only prudent to redefine long-term to mean something closer to 10 years than five years. If you don't need your money for 10 years, keep it in stocks. If you need it in five, put most in bonds and CDs. If you need it in five to 10 years, divide it. After all, though the economy is slowing, it's hardly a disaster.