ICANN does have ultimate authority over the entire IP range. You can't get from here to there without using those numbers, I don't care if you're China, if you use an alt root, or even new.net. That is at a higher level and you can tweak or choose there somewhat, but if push comes to shove no bits move over other than ICANN controlled chokepoints.|
Most parents wouldn't know how to filter ANY name server IP block that supports .XXX, it makes little sense to do so anyway, and regardless it is all still within ICANN's controlled space.
ICANN doesn't need to control bandwidth, why would they bother? This is yet another red herring.
Regarding your apparent distaste for academics, we wouldn't have an internet were it not for academia, and many of ICANN's most perceptive critics are within academia. Perhaps you'd like to point out where this consumer root is and the number of users. I've never heard of it so I assume it's just something else you've made up. -g