I'll definitely have to check out that one! I think Page is a great representative, but The Edge and Jack White, though certainly passable guitarists, aren't what I'd call
historical or
defining in any way. I guess the question, then, would be who would you get to represent Rock guitar from, say, the mid 80s to the mid 90s (presumably this is the slot The Edge held down) and then for the mid 90s to the mid 00s (presumably White's spot)?
For the 70s, though, Page is pretty spot on, I'd say.

I'd say Vai or Van Halen or Gibbons would work for the 80s (maybe not so much Vai--though he's a guitarist's guitarist, I don't know how much he actually defined Rock guitar in that decade). As for the 90s to the 00s, maybe Slash? Maybe Wylde? Maybe (cough) John Mayer?