In a way, I think it's ok. Instead of them in a stealth mode and when something is really important that's happening (like the first debate of W's re-election), they don't have the ability to come out of the shadows soooo fast and totally ruin the discussion thread. Which appeared to have happened...so many FReepers were bummed out by the troll's many many comments. We sure don't need that again...IMHO.
Sometimes a troll might seem totally tame, but it turns out Jim found their IP and/or e-mail address was a retread. You might every now and then see he himself make a post saying "so-and-so " is also known as.... (and he'll generally give several of the other banned monikers).