My feeling is that the increased prevalence of single-sign-on services like facebook connect, OpenID, google connect, etc. will help to mitigate baddies and pervs -- if you're putting your reputation on the line, anonymity is decreased. People will still make dummy accounts, but if single-sign-on is coupled with a karmic or whuffie type system it will be another tool to identify and discourage trolls.

Granted, we're a long ways away, but we're getting there.