This is the end of an era. There will never be another quite like him on a number of levels.
On a personal note, I studied him when I was learning - from using Cathedral as a solo audition piece for my first full-time pro theater gig, to playing Spanish Fly in my freshman year classical recital (and got some interesting looks from the faculty), to playing so much of his material in bars over the years.
It's hard to process the depth of his contribution to the rock guitar canon.