I'd like to try it for now, and see what happens. If troll-ery is all they're after, then the restrictions on the newly registered might frustrate them just enough to leave. I'd like some accessibility for the newbie.
Unless you want to make this EL wiki a fossil of the fifteen year old manga, we do need to have new people who encountered this manga/anime recently. So keeping some accessibility to them is essential for that purpose. I do not want this wiki to be kept forever in a vault of Wikia Museum by rejecting any access to new comers. (yk)
Now that my dander isn't up, I'm realizing I overreacted. Still, to find two such blatant trolls within a week of each other got to me. Mayhap we could make a scheduled check so that the wiki is never unattended for very long. Now, from Monday through Friday I get up at 2 AM Eastern US time, and can do a quick check continuously until 7 AM. After 8 AM, the rush at my job is in full force till I leave at Noon. Monday through Thursday I more or less have to be in bed by 6 PM. So I could handle 2 to 8 AM Monday through Friday.