I watched what you suggest in action over a period of four years in a suburban parish.

As a young priest began to preach on Catholic teaching, say prayers for our military overseas, change the appearance of the church itself to resemble a Catholic liturgical space, and reinstitute Catholic devotions to  parish life, a small but relatively loud segment of the parish complained bitterly and many eventually left. I would estimate the young end of this group to be 50-55 years of age.

Within a few months young couples began arriving as word spread, the age of the population of the parish shifted downward, infants and toddlers became common in the congregation, and the parish around the three year mark had to increase the size of the parking lot by 50%.

Sometimes things change.