*shouts @ Will for the sheer hell of it*
Learner bikers have never had to be accompanied... so why should it be deemed necessary to change that?
Are learners disproportionately represented in RTA stats? If that were the case, there might be grounds for it, but I don't believe it is.
The suggestion is not only that learners should be accompanied by, for example, a qualified rider, as learner drivers are allowed to be, but that it should be a qualified instructor accompanying them.
That costs the learner lots of extra money. Which means they'll do it with the least amount of hours possible and will therefore be getting through their tests with way less road hours than they might otherwise have had if they've taken the 125 L-plates route to riding.
Doesn't strike me as too great an idea...