I don't think cats will suffer a big loss outside the initial first month viera hype, just because they fit more the "cute eyecandy" look, also Viera suffering from https://en.wikipedia.org/wiki/Resting_bitch_face might be a factor that will turn people back to their cats.

Au Ra however... I do expect them to drop to third place at least in NA. The most popular Au Ra face already looks like a soulless expressionless doll and Viera is a massive upgrade over that.