Out of the blue as in the writers gave up on the show completely at that point because of the writers strike?
Writers, go back and change the ending!
If I remember well what I have read about Endgame (including in Mulgrew's interviews), everyone knew how much Janeway/Chakotay's shippers wanted - and expected - a happy end for this couple but, Braga and Mulgrew thought that in view of strong Janeway's temperament and complexities, she could free herself from the presence of a man with her, to keep doing what she loved.
And I thought that both were right to do that.
I mean, Chakotay wouldn't have been happy. Content for sure to finally have what he wanted for awhile but not happy because, well, he would never have been first in Janeway's life (Starfleet would always have passed first and foremost) and In spite of all his qualities, he would never accepted this situation, not on the long term in any case, what would have been quite normal.
-> in fact, I think that she did rather a favor to Chakotay by allowing him to find the happiness somewhere else with somebody who wouldn't make him be in the second position.
As for the choice of Seven for Chakotay, it was only because she was free and love was supposed to be the next step to reconquer totally her humanity..., even if I remain convinced that it was too early and that she wasn't ready to face some strong emotions like love, yet.
In fact, I would rather have bet on Chakotay/Marla Gilmore from the Equinox, who had much more chemistry in their scenes together in 2 episodes than Chakotay/Seven scenes in 4 episodes., IMHO.
And to all those who would set against me the rule of non-fraternization, knowing that Marla was a former lieutenant who became Enseign further to the episode with Equinox, I don't think that Chakotay was very looking on this matter. I mean, look at Seven, who though being a civilian aboard, served as an officer and obeyed as much to his orders as Janeway's during 4 years and this situation didn't prevent him from answering her advances, no more than he refrained of seducing Janeway, who was his direct superior). So....
