Alan Moore's Miracleman, started in 1982, is probably the archetypal example of completely ignoring the concern of being able to write and sell the book five years from now when writing the plot. The superman will fix your planet and your children and you and he knows he knows better than you. And it ends up mostly working out okay. Neil Gaiman actually started an interesting looking arc from where Moore left off, with earth having become weird, but the series got cancelled before it got completed.

It's important to note that the incomplete later segment of Miracleman was apparently going to make things not work out okay.