We didn't get to this population because women wanted to spend their entire child-bearing years popping out a babe every year or two. There really was no other option besides abstinence and back-alley abortions before birth control methods of the last century. Now that there are ways to stop pregnancy, and as long as religion gets out of the way, and women have access to birth control, the population has the chance of leveling off.
And thankfully catholic women are not being "Good Catholics" and following the ban on use of contraceptives.
"Among all women who have had sex, 99 percent have ever used a contraceptive method other than natural family planning. This figure is virtually the same, 98 percent, among sexually experienced Catholic women."