The concept of a "First Party" is dying as platform converge on each other. There will always be big and small publishers with requisite budgets and the "diversity" is always going to be at the small end of the scale, where potential losses are lower, individuals have greater control over their work, and the audiences they attract are more likely to buy something new. Most major tent-pole projects will inevitably follow established popular formulas to sell reliably.
Occasionally something exceptional will be produced and supported by a big name but it will usually be the exception. It's the same way in most major creative industries. Big movie budgets go to superhero reboots, star vehicles and brand marketing exercises. The "diversity" of cinema will always be in the documentaries, the small-studio animations, the breakouts from the art scene. I'm fine with it TBH.