^ AFAIK, no, there wasn't a plan for something like that.
Also we seem to be forgetting that Naomi's father was still alive. So even if that rumor was true, and Samantha had died, then he would of course take custody of Naomi upon the ship's return home. And that mythical couple would have been quite disappointed....
What you propose would only happen if Voyager returned home before Naomi grew up. In the meantime, prior to Voyager's return to the Alpha Quadrant, someone would have to take care of Naomi.
Voyager wasn't like the Enterprise. On the Enterprise they regularly left minor children alone after they were orphaned (The Bonding and Hero Worship).
Of course, Voyager lost the Borg baby, so there is that... Maybe they weren't so great at finding parents for orphaned children after all.
Wait... there's a continuity error.. The Borg baby!