No, I don't think it's best case, just normal case

because at the beginning of last slump, 1990, the economic conditions were FAR WORSE than today's. Actually, the recession was triggered by massive employment loss. Today, despite all the problems we have, even the credit crunch, employment is doing very okay. If you weigh today's trouble with 1990's trouble, we are much less troubled today. I am not sure you personally experienced 1990, I did, that's why I know today's much better.

Despite the severity of last slump, it only took the market 8 years to start recover.