I think coop in Uncharted would be a bad idea, especially if they have as much platforming as there were in the first title.
If people had to get their multiplayer-fix from Naughty Dog, I'd rather have it in a different IP, like Insomniac did with Ratchet and Resistance.
A question I'd like to pose, are what kind of difference in resources does it takes to do what I tought were oldstyle textures, such as having all textures handdrawn in Zbrush, like they said in the extras of Uncharted. Compared to just taking a photograph and scanning, and what are the pro's and cons about the various techniques?
Is the only pro unique'ness, or are there other reasons why everything were hand-drawn?
I would think the cheapest and best result would come out of a scan,..