I was listening to somebody from Google on BBC radio just yesterday, the CEO I think, or of similar standing and he basically suggested that snippets of information could be there for a lifetime and beyond. Not sure that those words were used exactly but amounts to the same thing.
Chris and Sarah can only delete what you the members submit, but that doesn't mean it's deleted from the search engines. I got the impression that Google would take down what was requested, certainly in the case of street views, but not sure they would entertain 'personal' information, I think they would be inundated with requests.