Problem is compulsory training would have to be setup properly to have any sort of tangible benefit.
I don't trust the government to be able to do that with any sort of competence.
Take the ACC approved trainer thingerbobbers they did in the last few months.
I'd love to take advantage of the ACC subsidized training they have, but the provider they picked is in bleeding Tauranga. So any money I would save from ACC subsidizing it, would be wasted on petrol there and back and either doing an extremely long and somewhat dangerous amount of riding training in 1 day, or on a place to stay the night.
There are lots of great riding instructors/companies in Auckland, and considering the largest amount of people is centered in and around Auckers, picking somebody in Tauranga (who does most of their training on the track

) reeks of idiocy.
That being said, the amount of people I see going in and out of the AUT bike parking section with shorts/jandals/teeshirt (and the way they ride before getting there) is scary as shit.
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