But this isn't about history, it's about corporate economics. Which is normally very risk-averse and prefers slow, predictable growth to taking big swings. All WotC/Hasbro are doing with the OneD&D "evolution" approach is treating D&D like any other product, as opposed to the TSR approach, which was "catch lightning in a bottle. Now, repeat!" But TSR was run by amateurs.
I'm not endorsing either method - "catch lightning in a bottle" is great for outsiders with very little to lose (relatively speaking) and is how we get most of our cool new things...like D&D to start with! But I am trying to make a prediction here about how a corporation will treat an established product with a significant investment and high brand awareness, and all signs point to "cautiously."