Experience. Our RCIA program uses the CCC extensively, and many of the catechumens and candidates go out and buy their own.
The shorter, condensed version of the CCC, to be compiled under the auspices of the USCCB, should certainly aid in making the CCC more widely used in catechetical programs of all kinds.
I hardly think that this is a ringing endorsement of the CCC, if this is the same diocese in which you openly claim that most mass going Catholics use birth control with absolutely no qualms; believing it fine to follow their own conscience in the matter even if it disagrees with constant magisterial teaching. Apparently the catechism they embrace has not helped them to embrace the faith.