google's disruptive feature

Google recently announced that from now on Gmail users can set their own custom sent time. This could be very disruptive to ediscovery's most popular embedded metadata "email sent time" if enterprise communication applications like Outlook, Lotus Notes etc adopt this. On one hand it was the number one requested feature by users on web because users have to participate in contests, they miss deadlines etc. But on the other it will make tracking email chronology nearly impossible.