We have exactly one (provisional!) 1979, which I retain almost solely for reference, except that I actually used it for a year or three.
I'm guessing it's well on its way to being an "historical document."
There are low-level discussions in our province about "updating" the 1928 BCP; calendars within it run out in the next few years.
My 1928 is on the bedside table and is used daily.