Toby, I have been thinking about this, as well, as I have been entering a lot of living folks from trees AJ sent me. I think weshould trace as far forward as we can, keeping those profiles private with public bio and tree. Then, we rely on AJ drawing and chasing people towards Wikitree so if living members are available, they can take over.
Otherwise, we just do the best we can. Having living individuals in trees is nothing new, but we do want to make sure we are giving them privacy. If someone is young enough to be a child, I just don't add them. Wikitree has a great privacy policy as it is-very little is made public aside from a name, and if you have used the internet to find their information, obviously it available elsewhere, so we aren't creating a new situation for the person.