From an uneducated view on this I would say that the weighting will remain for a period of time until the next crawl on your site and it will realise that the content has changed. Then depending on how good/unique the contect is and how the search engine rates your site then you will find out the result.
I may be totally wrong here but thats the way I would see it happening, but you never know with these guys and you may want to wait for someone who knows what they are talking about to answer. :hattip: