The popularity of American hops in American craft beers is in large part because Ken Grossman wanted to use American hops and wanted to set himself apart from European-style hops. To my knowledge that's pretty different from terroir as it's typically meant, and also Sierra Nevada is pretty far from where Cascade was grown when they started buying it.

By the time you get to Stone or Lagunitas and their West Coast IPAs, the hops are being packaged as I described and again we're not really dealing with terroir. The Chicago Lagunitas products tastes identical to the California ones.