If your story's characters don't end up in a different emotional space from where they began, neither will your audience. (Even on a sitcom.)
There is no bigger sign of an amateur than someone who's worried about their stuff being stolen. If you worry your show can be stolen… you haven't written it well enough.
You don't have to travel the world to have a smorgasbord of life experiences. You can have an infinitely rich life—full of fascinating characters, conversations, interactions, adventures, relationships—without ever leaving your hometown.
Don't blame writers for a dearth of originality. They're busy writing, developing, and pitching the most creative, engaging stories they can... but they don't get to decide whether those stories get made.