That makes no sense. It would only work if there is strength at times (which there will be), and this implies one could as easily buy on weakness.
Anyone looking at VXX yet. If so, you can begin to see how it works today. Even though the market is lower, it is not especially volatile and VXX is beginning to pull back. If the market goes sideways or begins to strengthen, VXX falls hard. The risk is that the market goes on a prolonged bear move, and then VXX soars. It has been the best way to make money I know of for some time now.