I for one plan to be running 3-4 Tool Scrappers in my decks for the BW-on format, regardless of Garbador's presence. Good-bye Evolites, Large Cloaks, etc. Hell, it's kinda like a double Plus Power if you think about it. Discarding those Evolites and Large Cloaks means you don't have to worry about the 20 extra damage you would've had to do otherwise.
So yeah, like many others, I'm skepticle about what impact Garbador will have. Granted, trainer lock from Zebstrika or Gothitelle (totally murdered the spelling) could help, but both are easily countered. In a Scrapper-rampant format, I wouldn't get my hopes up. Even IF Garbador made a surprise slash in the metagame, people will just up their Scrapper and Skyla count, anyways.