That burning up of resources of the good guys is exactly why a lot of stuff eventually derails. Just like the fight against the online crime rings that hold people's data ransom and that deface and destroy: the defenders have to succeed all the time, the attackers only have to succeed part of the time to be successful. So over a long enough run the attackers have an edge. Wikipedia is an exception, so far. Enough people cherish it that they are willing to put in the effort. But the day enough of them blink at the same time the assholes will take over. I hope that day will never come, but I'm not sure it will not. On a human scale Wikipedia is still very young.