If you have submitted information here, and the time comes when you no longer want to participate, you may want to remove your entire branch. Since you still own your data, this is certainly your right.
Deleting a whole branch can be very difficult, as it's like removing one thread from a spider web without the whole web being affected. Once you have your information online here, it may take on a life of its own -- it may be inter-linked with branches of other people. It may accumulate discussion posts from other people. So removing your branch is a loss for the greater Our Family Tree community.
Consider that other researchers might have attached themselves as descendants of people in your branch. This is great, as you are gaining cousins you might not have know you had! But then if you should want to delete your information from here, you are not just deleting your own, but other people's ancestors as well. To get a list of all of the conenctions from your people to people in branches from other researchers, go to Account > Find Current Connections.
As a better alternative I suggest that the information be left "up for adoption". You would no longer be expected to interact with the site and maintain your data, and other researcher(s) who have an interest in this information would be able to adopt it as their own, update it, and extend it as they like. Though your participation would still be valued and preferred, leaving the data for others would be a good alternative to deleting it. If this option is desired or if you have questions, contact the Administrator.