If the best known data is the best known data, then it is the best known data. This is where you start.
The rest of the post seems like advocation only of reactive policy decisions. These are far more costly than proactive decisions. Look at Ford v GM for example. Ford's strategic plan changed in about 2004/5 timeframe. They were going to focus on quality, gas mileage and efficiency. The goal was to get the company to a point where it could not only squeeze a decent profit out of a small/efficient car, but also make profit if the total amount of cars sold in a year dropped to 10.5 million (in the US). GM did not start this process until the market began turning. GM needs bailout/goes bankrupt, costs a lot of money (which was then moved to us). Ford doesn't need bailout, garners consumer goodwill because of this gains market share and is very profitable in a market which is still near a low for annual sales.
Did Ford's way cost money, yes it did. They borrowed a lot of money in 06 to get this plan off of the ground. Fortunately, though, by the time the market was turning, their cars had already won some accolades, and people were starting to get used to the idea of a Ford being a quality automobile. They started selling more, then the bottom fell out, and they prospered because they were proactive.
GM cost a whole lot more in taxpayer money, and collateral damage from their bankrupcy.
I personally prefer proactive policy decisions based on the best available data.