Are you actually trying to say it's a shame that Federer and Nadal have a rival at their level, because it makes it more difficult to beat records?

Would you prefer to have only one good player, and all the others worth crap, just so you could declare the guy "best player of all time" after ten years of one-sided matches?

About the Hawkeye issue, all systems are faillible. But at least, we can assume the computer treats both players the same (unless the program was hacked). Referees being human, they have a high risk of favoring a player, even unconsciously.