Comment by tptacek

It's not ICANN in that system, it's the TLD operators, and the problem with that is that for many TLDs and all the most important ones, you'd be adopting a system where your keys are directly managed by institutions we already know to have misissued. The most important TLDs are state-controlled, which is why you saw DOJ notices on piracy sites rather than NXDOMAINs.