In my opinion Uncharted is a lot like Tomb Raider or even Indiana Jones. Temple exploring is a lot of fun, but after a while it all sorta dries the same way.
I didn't play the last stand alone expansion because I spent my money on other games and frankly I just wanted something else.
I love the Uncharted games. I had PS3's 1-3 on launch and 4 I had right when it came out. I even had (sold) a second copy of Uncharted 4 that came with the PS4 slim. I even have the remaster digitally from day 1.
It's one of those series where you just fear getting burned out. Treasure hunting or even climbing forts is fun, but it also can blend together. I start to realize that I've gotta really pay attention to what's going on or I'm just completing an objective that I don't fully understand. I pay attention to the plot. I get behind the characters and their charisma, but when you want change, you want change.
I'd love to see something sci-fi. I'd love to relate to them again this gen. There are amazing games this gen, but sometimes I feel like they haven't made a new Star Wars type of universe or something to tie into future generations.
The Last of Us 2 sounds good. But it's far from being Uncharted. Like I said, Indiana Jones and Tomb Raider are respectively awesome in their own right. And being burned out by their games is something to dread.
You get a good sense of video game quality and then it becomes stagnant because it isn't always that refreshing.