Is Goodheart's Law a Good Measure?

Goodheart's law says that when a measure becomes a target, it ceases to be a good measure. In other words, if you pick a measure to assess people's performance, then we find a way to game it. For me, my target might be that i want to sell a lot of books, or even get a book deal. But then I start succeeding on medium, and then that is a measure of how well i'm doing. Then that becomes my target, where i've now shifted my goal, and now i'm obsessed with what was the means to the end.