While Ellie has had some closure on getting revenge for the murder of her farther figure Joel.
It has opened up and revealed some interesting aspects of Ellies personally her anxiety, confusion and anger. I dont think these things have been solved for Ellie. Though I dont not know how these things would be enough content for a new story Arc. Ellies first task after the ending of TLOU2 will be to find dina and there baby, this could set a premise for a new story if the baby ot dina were kidnapped or something like that.
Personally I would like a two part story where you continue the journey of abbie and Lev.
The other story would be Ellie back in jackson,where the relationship with Dina is on Rocky ground. You have to do daily tasks to do at jackson, but after a few months of doing jackson chores (about 5hrs of game time) a new threat comes to jackson where Abbie an Lev are involved.
TLOU2s central theme was that the pursuit of revenge never ends.
I dont know what the moral of the story will be in TLOU2.
But theres plenty to choose from.
Its a bad move from sony not to have TLOU3 straight into development as soon as TLOU2 development ended. Leaving stories unfinished sucks.