I live in New England, where the Catholic population is declining. Schools and churches are closing because there simply isn't the economic support to keep them going. Looking out my narrow window, it would be easy to claim that the Church as a whole is in decline. But, there are places in this country that have the opposite problem - the churches are overflowing!
U.S. Catholic ran an article on Catholic megachurches in the April 2012 issue: Where 20,000 or 30,000 are gathered