Ask HN: should new accounts really be able to submit stories?

It seems to me that the vast majority of spam on hn.newest is submitted through newly created user accounts. Many online communities, e.g. Metafilter, prevents new accounts from submitting stories to prevent spam. I think HN should implement something similar. Exactly how many days someone has to wait can be discussed, but I'm thinking anything from 1-2 weeks. This also gives people enough time to know the dynamics and rules of HN and to settle in, which I think will create a better community and submissions.