Subplots come next, but most of my attention is on The Mountains of Ao 2000. I always take time to plot the future of my series. I am always looking for new ideas. I don't pay well. Better yet, you keep your great idea, and I will help and cheer from the sidelines.
Some television shows propose one future.
Babylon Five, Voyager, Deep Space Nine, and others might come close. We must welcome the unknown and forever explore the infinite frontiers of our particular universe. The future is only limited by our imaginations. I write Science Fiction, Fantasy, and poetry, but I struggle to keep up with the advance age of this and that. Technology can and does overwhelm one.