Sorry, I wrote a long spiel about GEDcoms, but you are talking about orphaned profiles.
You may adopt the profiles on that gedcom if you wish to work on them - add sources, write a biography , add relatives etc.
But to answer your question - NO - the original GEDcom will no longer still be on the wikitree servers. Gedcoms are usually deleted after all the profiles have been created.
Sources can be searched for on Ancestry, Family search, FMP, My Heritage, Newspaper Archives and many other places.