I think it starts simple. Have you ever been watching a movie or tv show, and it shows the people walking up to the helicopter or Lamborghini and then cut to "they've arrived at their destination no transportation in sight"?

It will start out with more believable green screen backgrounds and b roll. Used judiciously, it will improve immersion and cost <$10 instead of thousands. The actors and normal shots will still be the focus, but the elements that make things more believable will be cheaper to add.

Have you ever noticed that explosions look good? Even in hobby films? At some point it became easy to add a surprisingly good looking explosion in post. The same thing will happen here, but for an increasing amount of stuff.