Wyatt_Derp
Arcane
Most MMA fighters have a good decade in them unless they started at 35. Creativity and avoiding being figured out starts to fade at around that point, and this can happen to guys still in their late 20's who are physically at their best and even most skilled, but their subtle telegraphs and patterns are exposed and they can't rewire themselves fast or consistently enough to keep up.
Video games, like combat sports, have an artistic element. The most noble artists know how to stretch out their allotted creativity decade over 30+ years instead of burning out. We haven't gotten them yet.
You can apply to that many things. Music, for example. How many bands do you listen to that have been together for 30+ years and are still cranking out shit that's as good as when they debuted long ago? Yeah, there's outliers here and there, but for the most part everything gets ripped apart by entropy sooner or later. Lightning can occasionally be bottled, but it rarely strikes in the same place long enough to make a bottled lightning factory.
And to make matters worse, we're living in an age when choices are many and consumer tastes are as fickle as they have ever been. Before you're even ready to market something that you think hits the zeitgeist, ppl are already onto something else. Human desire is rapidly exceeding human capability. Plus, the law of diminishing returns cannot be ignored.