An excellent idea but what should the number of (votes) to get a post deleted be ? i think 19 is too much regarding that there are threads dosen't have high number of views , also , shouldn't this be connected wth negative rep ? instead of just deleting the post u can give a warning..
what about new members ? how would they know about this ? if it's gonna be added to the rulez then it's ok , but there are enough rulez already ,,
i think it's an excellent idea but the way of forcing it is what am concerned abt