It was 90 years between the first and second Vatican councils, and when the third one occurs, there will be some accommodation of the reality of contraception (which is not generally considered a confessable infraction anyway),
Using contraception is still a sin.
Even having a contraceptive intent is a sin.
There will be no change in doctrine.
Has the Church ever backtracked once she has made up her mind?
Despite pressure to the contrary, divorce, adultery, fornication, sodomy, masturbation and pornography are still considered sins.
The church has never accommodated those behaviours.
The best predictor of future result is past results.
You can bet the farm on the prediction that the Church will declare that sexual acts not open to life are intrinsically immoral and therefore sinful.
How do we know?
Because the Church has taught this since the beginning.
There is not one statement in any Church Father that is favourable to contraception.
Conrad Black's assessment is very disappointing. Not historically rooted at all.
If there is a Vatican II, it will reaffirm Metaphysics 101.
It will be almost like an apologetics course.
It will basically be a re-cap of the papacies of Popes John Paul II and Benedict XVI.