RSVP--the lost meaning

RSVP--Répondez S'il Vous Plait is French for please respond.  I take that to mean that I am supposed to reply either way if I can or cannot attend.  People don't want to commit, or can't commit because of over scheduled lives and then forget to RSVP (I'm guilty of that). It drives me crazy.  As host, you are left wondering if people didn't get the invite, or what their plans may be.  As guest, you feel silly when you RSVP and are told that it's just regrets they are after.  If regrets only are what you are after, then by all means, say 'Regrets only'.  Makes life easier for everyone.  Just my PSA for the day.