Re: If Nadal/Federer defeats Fed/Nadal>Andy>Nole en route to the wimbledon crown...
If Federer or Nadal were to win over Federer/Nadal, Murray, and Djokovic, that would be pretty impressive. But I'm not sure that it would top Michael Stich's QF/SF/F wins in 1991.
In the QF, he beat #4 Jim Courier, who was coming off of wining the French Open. Courier wasn't the world's greatest grass court player, but he was competent enough on the surface, making the finals in 1993.
In the SF, he beat #1 Stefan Edberg, the defending Wimbledon champion, who also won in 1988 and made the finals in 1989, losing to Becker. Edberg was 25-1 in his last 26 matches at Wimbledon coming into that encounter and had swept through Queen's Club and his first 5 matches at Wimbledon without dropping a set. This was arguably the Swede's best form of his career as he was in the middle of his second year at #1 and would go on to cruise to the U.S. Open title later in the summer.
In the F, he beat #2 Boris Becker, who would become #1 after the tournament. Becker was also arguably in the best form of his career in 1991, having won the Australian Open and made the semifinals at the French Open. It was the only year in which he held the #1 ranking (in January-February and July-September). Becker had lost to Edberg in the 1990 and 1988 finals and won in 1989 (and in 1985 and 1986) and was 25-2 in his last 27 matches at Wimbledon coming into the match against Stich.
Again, Federer or Nadal winning this year would be extremely impressive. But Stich beating Edberg and Becker at their arguable peaks at Wimbledon in back to back matches would be tough to beat.