See_the_Change_in_Catholic_Population_Around_the_World___TIMENothing really new, but chart captures this trend dramatically. And from what I have read elsewhere, the growth in Africa is likely to reinforce more traditional views:

As of 2015, Europe had 267 million total Catholics, second only to South America–home to the most populous Catholic country, Brazil–with 335 million faithful. But Europe is the only continent that will see a shrinking Catholic population in the coming years, according to projections by the World Christian Database. By 2030, Catholics in North America and Africa will soar past European estimates. African Catholics will even pass their peers in South America, with 450 million followers by 2050.

Declining numbers in Europe largely reflect low birth rates. Take Spain for example, where 1.43 children are born per woman in 2014, compared with 4.8 children per woman in the Democratic Republic of the Congo. Growth in Southeast Asia follows a similar trend, like in the Philippines where 3 woman are born on average to each women.

In the United States, about a quarter of the population has remained Catholic for several decades, shows a 2013 Pew Research Center report. In 2015, 73.6 million U.S. Catholics made up 6% of those faithful to Francis worldwide.