I saw someone suggested that it could work by account number instead of handle name.
I pointed that out a few times, but I know I'm not the original on that. If it's tied to the account instead of the name, then it won't matter if they change their handle a million times, they would still be squelched. And since it's tied to the account, if the account is deleted, the squelch will be auto removed as well. So if newbie uses the same account name as arsewipe1 was using, he wouldn't be left hanging.
If a system like that was in operation, then I don't see an issue. The problem is that it will draw HTC away from other things, and I honestly wouldn't know how much coding would be needed for it to work properly.