I'm not allowed to let a thread die. I took the hippocratic oath.
Sometimes I write on a thread "DNR" or Do Not Resuscitate though. I do think there comes a time when the thread just gives out, y'know like something dying; Almost like "come in number 1, your time is up." Ah, then we pass through the tunnel with the light at the end; we TRANSCEND, if you will, and pass up into that great forum in the sky.
Reminds me of that song by the Prodigy "I'm a thread starter, sadistic thread starter....hey hey hey..."