Here's my idea:

SE can either develop, or use already developed tech that transfers YOUR OWN VOICE into the game, effectivly making you the voice actor for your character. I have no idea if this tech even exists but just humor me for a moment.
Say in the character creator, you have to (or voluntarily) install your own voice into your character. To do this, SE will have us read a paragraph for the software to accurately record our tone of voice, accent, mannerisms, and stuff like that. Then when in a CS with our character the software uses our vocal data to actually speak out what is written in the cutscene.

Again, dunno how much of this actually exists or is just in TV shows, would be kinda cool though. If it does exist, it's probably crazy expensive.

Maybe we should just talk to ourselves when our characters speak lol.