My initial response to this was that maybe it could get resubmitted with the boosted number of upvotes, so it would have a slight edge over new stories being submitted at that time. In addition, you could have this only effect stories with less than 10 upvotes, to prevent people from griefing the system. (spam submitting the same link over and over/necroposting old content with lots of upvotes by reposting it and giving it just a +1 for your resubmit).