In a recent interview, psychologist Carol Dweck reminds everyone that "growth mindset", while a valid and important concept, is not the be-all-and-end-all of success, and is hardly a panacea. I mention this because I've heard quite a few progressive-minded people tell me that "growth mindset" is what REALLY matters for success, more than anything else. I'm glad that she's adding some nuance. It seems to be the destiny of every Great Big Educational Theory to go through a cycle of discovery, promotion, hype that exceeds the original intent of the founder, and an eventual disclaimer by the founder. This pattern goes back at least as far as Dewey, according to Hofstadter, and is probably even older than that.
All of this has happened before and will happen again.