The Austrian School developed out of neo-classical 19th century economics, and is generally viewed as a continuation of classical liberal thought. Meanwhile, other schools like Keynesianism and Monetarism had long stretches of dominance, with the Austrian school generally being viewed as a kooky heterodox school, for a bunch of reasons (ideological trends going towards more government intervention, the school's rejection of econometrics and mathematical formulas), etc. Even so, one of the leading lights of Austrianism has a Nobel Prize, and the Austrian School didn't really become irrelevant until the 1950s.
What changes (either in dominant worldviews or in the Austrian system itself) would you make to make Austrian economics mainstream, if not dominant?