re: Would you ever be open to a Back to the Future reboot? Could it not be screwed up?

Emmett means "Universal Truth".
Brown is a mixture of red, blue, and yellow. Just like film light projectors.

So, Doc Emmett Brown is a Universal Truth that is projected like a film. To Spielberg, film allows you to go back in time and "correct" previous mistakes that you've made in life. So, Marty is a projection of Spielberg himself.

Doc Brown invents the "flux capacitor" or "change storage" device, i.e. the theater, so that people can set right past wrongs by projecting the idealized history into the future.

Things go off the rails as Doc Brown and Marty both toy with forces beyond their capacity to understand or control by using the device for personal gain.