Nadal's not going anywhere, even if Djokovic continues to beat him (and I believe that he will continue.) The same way that Federer isn't going anywhere even with his losses to Nadal.
This just goes to show even more why H2H is not a major consideration in being the GOAT. And not just that, it's also why H2H can't be a major consideration on how good one's career is.
There's always going to be someone that has their number. And ironically it seems like Roger has Novaks, Novak has Rafaels, and Rafael has Roger. I mean I look at Andy Roddick, and he's not a bad player, he's been number 1, he's won a slam, but Federer figured out his game, and how to beat him almost everytime.
I don't think there's a single game out there, that matches up well with everyone else's game, it just doesn't exist.