i would say its 80% bussiness's that suffer from the post office as they would send alot of mail in and out everyday and depend on it where as ur average person would send say 2-3 letters a week at the most so i think most ppl wouldnt really notice this lack of hittin there targets.
but wat would happen if it went private? would the other companies have like there own post boxes etc?....lol but with the majority of ppl usin email now for everything is there really a need for a private sector of the postal service??