Looks like we may have evidence Naughty Dog is aiming for large scale open world with Factions II. All who voted 1, hang your head in shame.
That video gets the motel wrong. There's a motel in Seattle Ellie goes past. That map isn't referencing anything from Jackson, its Seattle. The motel and gas station are both part of the Capitol Hill area from day 1. The singleplayer game of Part 2 was originally going to have a large open world map design with a hub world, like God of War's lake of nine. They scrapped that idea early in development. The map could be left over from that, or it could indicate a larger map possibly for the online modes. Idk.
They're not gonna combined areas from Jackson Wyoming and Seattle Washington into a single map lol. But sure they could possibly make a big map for a mp mode using of a bunch of the Seattle areas. Not sure how it would work on PS4 tho if it would be much larger than the singleplayer areas. Loading/unloading it all as the player travels around could be tricky with the PS4's HDD. Easier to do with a linear singleplayer story game, versus doing it with online mp and random player movement all over. But Warzone's map is huge so idk, its possible.
For reference (ignore the arrows, these pics are from a collectibles guide):
Motel
Gas Station