Kung hopes against hope.  The Vatican ain't gonna change till every Christian group comes home to momma. 
Christianity continues to wane among thinking people. It will appeal to the susceptible, the uncritically thinking, etc.
One can salvage the best of Jesus' thinking without having membership in any church.  We ought to gleam what is good from any source without having to be part of the group.  If something is good and true, it stands on its own legs. The group doesn't equate to witnessing to what is good & true.  Think American Christians who savaged native Americans & enslaved Africans while lifting up Jesus in prayer! 
Didn't Francis Francis claim recently that there are many atheists who live and nurture the gospel value more than some Catholic daily mass attendees.
And one can get the best of Jesus without having to put money in the collection basket!
The teaching is easily accessible; the practice is the rub.