I found this article by John McMahon, Starter Inc. very insightful about where Material Design fits into the “battle” of Hybrid mobile development. Ultimately, the weight of native mobile application development is too much… too expensive, too time consuming and too slow. The web must be “brought back to mobile”. It needs to be supported, and highly performant – just like native. And we need a common “UI” or look so apps are more uniform across devices.