I've been working with and around design thinking for a number of years now, and while I am certainly familiar with David and Tom Kelly's work and influence, I had not actually read their book Creative Confidence until last week.
There are plenty of good reviews, summaries, and other artifacts already out there in the world as the book was published 5-6 years ago. Most encouraging for me, today, is that the ideas and approaches for thinking about one's own creative mindset and general self-efficacy seem to have already taken a strong foothold in many of the education circles to which I am closely connected. The long game, then, is that the young people learning in those environments stick with it - even when they go to schools or work with teachers who may not understand it. I hope they will use design to correctly play the game until they can put themselves in a position of relative influence and authority to change the game.