Replying to Member Sweep

I think it would be good if the inactive members of NS were deleted.  This is just an idea but a good way would to do it is messaging all members with a post count under 1000 (or some other number) that have joined prior to (some date) and asking them to reply.  If they reply, then they stay, if they don't within a month (or some other length of time) the account is removed.  For example the owner of NS_NOOB1234, who has a post count of 3 and joined 2 years ago would get a message, and if he he doesn't reply, the account is removed.  What do you think?  This will give us all a better scope on the number of actual members in NS.