When Uncharted 3 was announced I expected it to be the last game in the series, the magic number three you know. Trilogies. But since it wasn't and a fourth one is coming now I will go with 6 games. :P
Just, because.
EDIT: Also I think that it would be nice, if they made 6 games and then changed the main character. Kind of like with Bond movies. I would have liked them to do this already after the third game, but one part of me really loves Natan Drake and Sully, so it would also be really shame if they changed.








