Well, that was an unexpected ending. And
according to the producers, it's not a cliffhanger or a setup for a new quest, but a permanent change to the show. A pretty courageous choice to make, but that's not unusual for this show. (Although as soon as Q and Alice reaffirmed their love moments before going on an incredibly dangerous fate-of-the-universe mission, I kinda had a feeling...)
It's actually kind of refreshing that they didn't end on a cliffhanger, aside from the brief setup of what's gone wrong in Fillory and what's possibly next for Alice. I like it when finales are actually finales, when they're a meaningful resolution to the season's storyline rather than devoting a lot of their time to the setup of the next.
I think this is the second time in the past month or two that I've seen a TV show use a cover of "Take On Me," but I can't remember what the other one was. Honestly, I'm not a fan of that song. "Take on me" is a strange way to put those three words together, and I really don't know what the refrain means, and I don't think the melody and the lyrics sound that good together. Some words sound better when sung as sustained notes than others, and "take" is not one of them. Well, at least they didn't try to do the falsetto bit, which is the most annoying part of the original.
Oh, I just remembered another place I heard the song a bit less recently, which was the trailer to the
Ready Player One movie, where it was arranged partially orchestrally. Which was a coincidence, because I saw the trailer right before
Black Panther, whose main theme is almost exactly the same melody as the "Take On Me" refrain.