Here is another way to think of this.
You are always 100% invested - the trick is whether it is in the markets or in cash. Think of that carefully when tempted to time markets (whether its appropriate to be X% in cash).
Do you think most boomers will 'rush' to empty the market and be invested in low-return vehicles with inflation knocking on the door?
I think the rush to cash out will be when boomers less conservative (spend-thrift) children inherit the money
Which will stimulate spending, and therefore economic growth, which may prop up the market?