Just pointing out with the Dugtrio issue, Terrakion or Breloom can slide into just about any slot that Dugtrio would've occupied. They're all heavy compliments to special attackers and form a dynamic duo with gene. Personally I'd say they're interchangable so you can't just blame one of them, if anything there's much stronger cases Terrakion or Breloom would need to be banned / nerfed.
Also as a rule of thumb use Dugtrio to compliment special attacking teams and Magnezone if you wanted to compliment a physical attacking unit. That's just what works in BW- Magnezone isn't doing anything about Blissey / Heatran and Dugtrio isn't doing anything about physical wall steels.
For Genesect itself I have no doubt it'll be banned and while I'm sure the "it's fucking gay as shit" factor will play into it you have to remember that Heatran / blobs is a pathetic list of reliable counters. Both are very easy to beat down with hazards in BW2 (especially with this Shed Shell spike on Tran), have the compliments of Breloom / Rak / Dug to try to deal with which could make them a liability, and all check what they do in very exclusive ways. Of course any mon can take a compliment well but when you have a pokemon that takes it and sweeps on another level and provides an extra Steel for your team (don't forget how huge that is) you begin to separate it from other top threats without even looking at a usage chart.