It is fun to speculate on miner strategies, but the bottom line is: there will be money to be made, and those miners who employ the best strategies (could vary from scenario to scenario) will be rewarded. They'll come and go. The miners, and the strategies.
It might not always be "stable" in the sense that no one strategy may work all the time, but the world economies are constantly changing. I don't think we want mining strategy to be static, or even "well understood". That strikes me as almost conceited - to think we could understand an entire foundational industry that well to know that one strategy would or should be the right one for any extended period of time.