Kurt Angle vs. Daniel Bryan
I'm confident two of the hardest workers ever to step foot in a ring could deliver a wrestling match that would be off the charts with excitement despite their injuries. Matter of fact, I believe their history of injuries would effectively play into the drama.
Asuka vs. Io Shirai (she sorta counts as WWE now, right?). I really hope this match happens before it's too late. They're two of the most talented women in wrestling and it would be a huge shame if they never faced off.
I would have loved to see Joe and Lesnar at one point but not anymore. Even ignoring the fact that Joe is well past his prime, all of Brock's matches are the same. This wouldn't offer anything unique or special in the present day. You could pretty much swap out Joe for anyone else and get the same thing: Suplexes, Brock no sells, Brock kicks out of finishers, suplexes, F5.
"The King of Swing" Cesaro vs "The King of Strong Style" Shinsuke Nakamura vs The King of the Cruiserweights" Neville vs "The Kingpin" Dean Ambrose vs "The Demon King" Finn Balor vs The King Slayer" Seth Rollins vs The Celtic King" Sheamus vs "The King of His World" Chris Jericho vs "The Drama King" Aiden English vs "The King of Kings" HHH vs "The Last King of Scotland" Wolfgang vs Kofi Kingston, in a 'King of the Mountain' match.