The people invested in the Unity ecosystem will stay, but Unity drove a lot of people to Godot and Unreal. Unity now occupies a weird space where it's more expensive and harder to use than Godot, but not as powerful as Unreal.
As someone who has taught middle schoolers game development, Godot will absolutely replace Unity for students not only due to its price and licensing, but the ease of getting it deployed on a fleet of machines without even requiring a separate IDE.
Has Improbable completely abandoned the game market now? Their website reads like a crypto venture fund and their CTO and CCO left last year.