I'm not interested in a happy ending with a wedding or children laughing. Larian has good writers and I also prefer to write tragic or open endings.
I absolutely want that after knowing Shadowheart wants Tav to get her in a family way when all's said and done. And Wyll literally does a marriage proposal. They can't just tease like that! It doesn't have to be any more official canon than an ending for her where Tav kills her on the beach or makes Wyll leave after raiding the Grove.
I just want a final chance to talk to my companions in a camp type setting before we all head our separate ways. I think leaving loose ends will be great if the game gets dlc or an expansion.
It should still give the player choices. It seems the only two who, with the current endings, aren't up for a new adventure are Lae'zel and Shadowheart, the rest are all up for more as a group. Astarion and Karlach are just tied by circumstance, but a 'fix' for Karlach is hopefully being worked on already.