I think so only because then the work by other players (athlete + kalin) goes down the drain because they got that set up specifically so that attacking all the way around the world was less risky. In other words, they get ripped off just because the current player left the game.
That said, I think if I was taking over the first thing I'd do is cancel the NAP's (adhering to the cool-down period) and then re-negotiate them if/when I felt it was a good idea. I think you can do that and still get a fresh start diplomatically, or at least pretty closely. But yes your hands are still tied for a little bit but that's life.
Edit: I agree with what T-Hawk said though. I just think the "right" (or honorable or however you want to put it) thing to do is to honor the deals.
That said, I think if I was taking over the first thing I'd do is cancel the NAP's (adhering to the cool-down period) and then re-negotiate them if/when I felt it was a good idea. I think you can do that and still get a fresh start diplomatically, or at least pretty closely. But yes your hands are still tied for a little bit but that's life.
Edit: I agree with what T-Hawk said though. I just think the "right" (or honorable or however you want to put it) thing to do is to honor the deals.