They got home in season 3.
Just because they were too stupid to figure out how to get back to the future by themselves (Slingshot, Guardian of Forever, Suspended animation, relativistic speeds to Alpha Centauri to kill time... They're morons. Scotty bent time just by fiddling with his engines during a cold start up, but then Scotty figured also out how to transporter suspend someone for seventy years when Janeway's lot were getting genetic mutation after a couple hours held in their own buffers.) it blarringly seems just like they humbly consented to internment in the DQ by power from on high. They frakked the Aeon once before and left it's Captain marooned in the ass-end of the 1960s. Why not do it again and be masters of their own destiny instead of pets lead about on a leash by idiots erratically fighting a temporal cold war with the elegance of Australian's badgering for a root? Everything that happened after that point was selfinflicted because they all didn't have the balls to be QuasiCardassian about the meat placed at their feet at that there crux and say "No thank you and fuck off" just like they'd said to Q a few months earlier.
Hells bells, if they could get back to the future from from the last days of the American century, think how much easier it would have been to find their own personal "today" if the divide was only 2 decades like during Eye of the Needle"? And if they were time masters? Why not, in the beginning, just go back to before Caretaker was senile, meet up with Susperia when she first legged it, or intersect with the rest of the Nacene before the rest of them, who were to smart enough and important enough not to be left behind on a backwater garrison like a telephone sanitizer, ditched the two Caretakers to their consigned fate?
The usual.
John got home early in farscape, just in time to see that his own puny needs were selfish compared to the weight of all life earth being exterminated by the bastards chasing him, so he about faced and held the line. Thank god Voyager had no continuity, otherwise they couldn't pretend that every loose end was tied off when the final credits rolled over Janeway's undeserved grin fro a job well done..
Besides, as Fun as the Odyssey was, I more preferred how Odysseus got Penelope back in the aftermath of the adventure.
And the BSG people got to earth more than once, or so they thought in BSG, Gilliganing themselves just a little, but the show didn't end when they saw earth. There was hours of TV still left over to play out after they finally found a parking orbit around Sol III.