Given that the wired connection is unlikely to change any time soon (unless anyone at VF or Chorus knows different?) then the only realistic speed upgrade I can get for the next 2 or 3 years is to use mobile instead of fixed.
However, I would want a 50gb allowance and no mobile plans get close to that.
My question is why don't they?
It can't be a technical limit - you can get 3Gb on an iPhone, so 10 iPhones = 30gb etc so that can't be the issue.