I remember seeing somewhere they will live happily ever after.
I don't remember hearing that ALL of them will live happily ever after.
I've got my theories of what will happen but we'll see.
My main theory is I know the MC is going to survive, pretty sure he's going to be the Fae's new god in place of his dad and unite the Fae and Camelot .... hopefully.
Also pretty sure a certain someone is going to make a comeback. I think that was obvious by the reappearance of a certain divine weapon.
I don't want to be Debbie Downer about some plot elements but Katie has been painted into a corner, I think it's impossible to give her a happy ending. She can never have what she wants and with her extended life she'll be miserable, well, forever. I personally think the only way forward is either her death or Our godling taking multiple wives but I don't think Emily would go for that. I just don't see a way this ends well for her character unless she moves on from him and we all know what 3 little letters people will cry about that. I just don't see the FWB status lasting eternity.
MC NEEDS more kids. Little Ele will be a force of nature with her power and who she has training her. Your average kid, Fae or human mage, isn't going to be able to keep up and she'll need other kids close to her level leaving only the Chosen, Katie and Fia (mainly because we know Fia has no issue having kids with gods and if Thor supercharged their line imagine what super powered Mc would do to it).
Molly needs to be a Dragon Rider. No reason other than Draco needs to stay good and Molly would look badass in leather riding a fully grown Dragon she's mothered.
Last one is a personal wish....
I want either Jalsa to make a comeback or Aino to get out of her contract and be tied to Eleanor as her bodyguard. Either of them would be perfect for the role and Aino is too good to let her go back to working for that creepy old shit but I don't think any more Chosen are going to happen.