The question is not whether or not there are things one could do if one knew what the future held. The question is how firmly do the prognosticator's believe in their own analysis. Is it all noise or are they putting their money where their mouth is?
And even if they are confident in their own analysis, and they're investing in their own convictions, is their confidence warranted or misplaced? (Odds suggest the latter in about 80% of active investors long term.)
I use a very sophisticated market timing strategy which I'll share with the group. (Please don't post it elsewhere, it's proprietary.)
1. Buy a diversified portfolio of low cost index funds.
2. Rebalance once a year.
3. Ignore the noise.
But then, I was never very good at prediction.