Completely different experience on my side.
I've seen a couple of lightning Wizards before on OCTGN, most of them played the premade official spellbook. Never seen Staff of Storms used successful in a game though.
I did not encounter a Blasting Banker for a year ... since Acid Ball has been released, the Banker suffered a lot of potential.
I don't know what you mean by "generic" Wizard or Warlord. A Deck, that has not a famous name or has not proven successful? Every player follows a certrain tactic.
I see some Warlocks these days, that try to use Curses AND Fire, but most of them fail. Seen a scary one though, that used Fire only, but maybe he had luck not to play against enemies with a lot of Fire Resistence.
Falcon Swarm and Rushmaster come up from time to time, but they are more fun builds. They get in a world of trouble quite fast if their opponent knows what he's doing.
Mages i've seen a lot in the past 2 weeks while watching games: Spores Forcemaster, Catapult Warlord, Cleric Priestress, Canine Beastmaster
Finally, i cannot agree with you. There are many many builds out there. Almost every game i face different enemies.