Well, kind of, but it relies on the ending of another faction. You're right that the endings for the Follower's are all pretty much bad or slightly better than bad, the "best" being:
Spoiler "After the NCR's victory at the dam, in part thanks to Follower medical support, NCR allowed the Followers to care for refugees as they see fit. Old Mormon Fort expanded its services and was able to aid more people, becoming a refuge for the less fortunate citizens of New Vegas."
However, if you assume they got the bad ending which forced them to
leave the Mojave, then assume the Great Khans got this ending:
Spoiler During the Battle of Hoover Dam, the Great Khans quickly evacuated Red Rock Canyon and headed north and east into the plains of Wyoming. There, they reconnected with the Followers of the Apocalypse and rebuilt their strength. Bolstered by ancient knowledge of governance, economics, and transportation, they carved a mighty empire out of the ruins of the Northwest.
Then that can be considered a "good" ending for the Followers.