A small wrinkle, industries seem to have little issue with acting collectively to spend cash on enacting policies that benefit those industries. For example, the oil industry has successfully blocked climate change action for decades even after they knew an action was needed. Perhaps they're not as powerful as Standard Oil but they surely are powerful enough to profit maximize at the expense of so much else.
Put differently, if the breakup of monopolistic industries in the first half of last century produced a virtuous cycle, which supposes some durability, why do we find ourselves with virtually the same problem today?