Agree most of what you write, but I don’t think it will happen, unless they open up the missions to third party devs. Based on what I see in the current missions, I doubt Asobo has the competence, resources, motivation or creativity to implement any of this.
Oh, please, don’t. I’m an adult, let me decide which missions I want to fly.
In the meantime, vote here: Career Mode Sandbox Option - Make Missions Available as option in Free Fly