Re: probably be replaced by something else
"it was USA arrogance that DNS, IP assignments and Domain registration wasn't ITU from the beginning. "
The ITU didn't _want_ to be involved in any of this stuff until relatively recently.
In any case, ICANN has exactly as much power as people choose to give it. There have been alternative DNS systems and roots setup but they've all fallen over - largely due to ICANN being the monopoly, but secondarily due to ICANN playing 9000 pound gorilla and deliberately rolling out TLDs which conflicted with those of the alternates (they could and should have been charged with anti-competitive behaviour over that one and the decision to do it was _very_ deliberate)