What would be the best way to preserve all of the data in print that would be efficient and clear, but not as a book? Something serviceable, but not necessarily smooth and pretty! (This foregoing is another thing that has keep me up at night!) Any advice from you or anyone else on this question would be welcome.
Re electronic genealogies, I believe that Family Search would be the best bet for attempting to preserve genealogies digitally because of its institutional affiliation with the Mormon church. The Church has been, and I think is likely to continue to be a more stable entity than any online company--commercial companies come and go, but major religions tend to stick around longer. Also, because of genealogy's central role in Mormonism the motivation for making sure the data is protected and continues to be available and accessible is greater than that of commercial enterprises.
Erika...Everything you said is what I am thinking about...a book is static. But it's better than nothing to give to relatives. AND..what a conundrum about printing portions for each part of my tree! I have Ancestry.com famiy tree but I think I will add it to Family Search. Here's something I never thought I would have to say..."I hope the Mormons are around a long, long time!".