A lot of people talk about getting a lot of money (the time travel thing is useful in that scenario) and then retiring. But the vast, vast majority of people who make a lot of money and sell out then spend the rest of their life (and money) funding and investing to prove to themselves that it wasn't a fluke.
I'm not sure that anyone can simply decide to play 'Left 4 Dead' for the rest of their lives and actually be fulfilled.
So even with a big bank balance there is still the urge to 'do something'. Why would it not be software dev?
"If you reward everyone, there will not be enough to go around, so you offer a reward to one in order to encourage everyone."
Mei Yaochen in the 'Doing Battle' section of Sun Tzu's: Art of War.
I did not say I would not be developing software - I just ment to say that I would not be doing it for a living. I have a passion for software development - but it is partly driven by the fact that is the best way I can monitized my talents. I have other passions as well. After 16 years of software development I might explore them too. If you are financially independent basically EVERYTHING you do is a hobby, and hobbies may come and go in the course of a lifetime