Yeah, the thing that's probably ultimately going to limit the life of Twitter's latest automated anti-abuse measures is that left-wingers who fire nasty, vitrolic, vulgarity-filled tweets and invitations to kill themselves at users on the right are also getting their accounts automatically put in time out or even suspended for it, and they're getting really pissed off about it. Sooner or later the press is going to get hold of a sufficiently sympathetic example and that'll be it.