She would have said in the pilot after Caretaker had been resolved, something like "70 thousand Light years is a good start. Lets keep going and find out what's really out there."
But, turning back...
Going home?
Running back to mummy's tit?
That really doesn't seem like the antics of a woman who swore an oath to seek out new life and new civilizations, to boldly go where no one has gone before, does it?
It would have changed the premise completely. Instead of telling the aliens of the week that space is big and scary and they miss some home cooking. it's going to be "We thought it would be nice to meet you."
Really, it would have only been a 15 year detour at most to see the Galactic Barrier, which would be of some interest to find out if it's any different on this other side of the Galaxy.
The Maquis didn't have a home to go to, and frankly neither really did the regular Starfleet either (to a point.) since it's likely they burnt most of their bridges to be so committed to their careers.
But how would the crew have reacted if Janeway had decided to go forward instead of recoiling to wards the home front?