I love Nadal as well. But I give no real shot to approach Fed's record. His game is simply too physically punishing for him to last as long as he needs to rack up the majors. That is one reason why Fed is where he is as well - he has remained remarkably healthy throughout his career, largely in part due to the smoothness/low impact nature of his game/movement.
But, I have been known to be wrong once or twice...