Ah, I see. I don't have a clear enough intuitive grasp of the frequency to agree or disagree, but that does seem plausible to me; Wikipedia's developing immune system has been forcing troublemakers to evolve into new forms. I guess I'm just lucky I haven't run afoul of the new breed much. :)
Hang around the 3RR reporting page some time. Edit warriours have largely adapted to deal with that now. more advance forms of technical vandalism tend not to do so well since for the most part they are delt with quickly by developers.