The anonymous gibberbots are increasing in number. I really hope the captcha and the anonymous editing changes are going well.
It's disappointing what some people think of as fun.
1-word gibberish edits are at least an improvement over the link spam, but I agree we need to get rid of them, too.
If disallowing anonymous edits is the only way to do it, I don't think that will be much of a loss in practical terms. However, in principle I think it's better to keep the wiki as open and free as we can.
The ConfirmEdit captcha extension is configurable to trigger a captcha on edits by anonymous users while leaving registered users alone. I'd like to see if that's enough to block the gibberish.
Of course, if it's not bots but people sitting at their PCs typing "klsdfoisdf" into wiki pages, the captcha won't do much good. In that case blocking all anonymous edits is probably the only thing we can do.