I agree. I found the ending powerful and satisfying.
If they want to milk the franchise, it'd be better to go with new protagonists with no connection to these ones, and a whole new story line on the other side of the continent, or maybe a whole other country.
But at that point is that even worth the energy (since they'd be restricted to the universal laws and mechanics established in the last 2 games), compared to just making a new franchise from scratch? One that's maybe not even zombie based.
nah I think you would kill momentum if you just hopped to new characters. They have to continue this story line, it’s the entire reason they introduced new characters in part 2. They knew the Joel/Ellie story couldn’t go on forever.
part 3 should pick up right where 2 left off. You spend the first part of the game wrapping up Ellie’s story and then jump to Abby/Lev. There is a lot of directions they can go with those two.