I think the shutdown of seclists.org by GoDaddy is a perfect example of exactly why the registrars should NOT be making these decisions.
I know the head abuse guy at Godaddy. He is a reasonable person. He turns off large numbers of domains but he is human and makes the occasional mistake. The fact that everyone cites the same mistake tells me that he doesn't make very many of them. If you demand that the shutdown process be perfect and never make any mistakes ever, even ones that involve peculiar e-mail failures are are fixed in a day or two, you're saying there can't be any shutdown process at all.
If you want a really simple, and probably very effective first step- then stop domain tasting. It doesn't help anyone but the phishers.
Actually, I have never seen any evidence that phishers use domain tasting. Phishers use stolen credit cards, so why would they bother asking for a refund? The motivation for tasting is typosquatting and "monetization", parking web pages full of pay per click ads on them. Tasting is a bad idea that should go away, but phishing isn't the reason. R's, John