I think they could force the porn onto xxx . You just remove the dot com from them and give a free xxx. ok they can then come up with agkagkgkasgksgad dot com but that wont achieve anything. They are selling porn after all and having a xxx would help them.
It wouldn't help them if lots of companies were blocking their content.
How would you feel if you'd paid millions for a good .com domain, and then someone came along and took it from you and replaced with a new .xxx instead? I'd be pretty miffed.
Imagine for example that ICANN decided that only americans could have .coms, and that brits should use .co.uk, and therefore came along and took your prized .com that you'd spent millions promoting and building traffic to away. How would you feel?
This entire debate shows no concept of the scale of the task being advocated for ICANN. It is a technical body - it has zero resources to police the content of domains. It would be like asking the mobile phone companies to ensure their products aren't used by drug dealers, escorts etc... its just too expensive.
ICANN is a private company. Its revenue comes from us as domain owners. If we decide that we want a colossal bureaucracy to enforce what domain owners do with their domains then
1) we've got to be prepared to pay many times more for our domains
2) I'd suggest they start policing more damaging content first. Like for starters
- close down any domain that is used to host a spam promoted website, and to insist all spam is sent from a .spam so its easily blocked (of course this, like trying to stop porn on any site other than .xxx just won't work)
- close down any scam or phishing sites
If ICANN wants to start policing the net, they could start with these two things that are much worse problems than porn.
But think about it, not only the massive new costs of policing all this, but the legal costs, the appeals, the claims that "its not porn its art", or "it might be porn in USA, but here in sweden this is light entertainment" etc etc. The bureaucracy required would sink the net.
But trust me folks. This will not happen. XXX domain might well come into being, as might .sex with the new rules. But ICANN or anyone else doesn't have the resources to prevent pornsters using other domain suffixes, and they never will. It isn't going to happen, its complete fantasy, its just the same as expecting them to be able to prevent spam by insisting on a .spam domain.
Lets face it porn sites are easily blocked anyway - there are plenty of solutions out there if you really feel you or your kids might "accidentally" stumble onto something like this.