Well, here are my answers re wikipeople.
1 Should this project exist?
If there are people who want it, I don't see why not.
2 Should the current Sep11 wiki articles be moved here?
This is a question which should be determined by the people who use the
wiki.
3 Should the Sep11 wiki be removed and redirected to Wikipeople?
That should be up to the people who use the sep11 wiki.
4 Should the creation of this project wait until a Wikidata structure
exists?
I've never heard of Wikidata, so no.
5 Should Wikidata be a project that can hold both Wikipeople and
Wikispecies?
Definitely not. Wikispecies and Wikipeople are completely different
projects created for completely different reasons. Wikispecies is supposed
to be a language neutral subset of Wikipedia. Wikipeople is largely
supposed to be for information not in Wikipedia.
6 Should this be a project in its own right with no links to Sep11 wiki or
Wikispecies?
Certainly.
7 Which domain should be used?
If we own
wikipeople.org, that would be the best.
Anthony