I think pushing college, student debt and focusing on career above all else (especially for women) is more of a causal factor than dating apps. Too many get sucked into career to even think of committed relationships or being a mom.
I think the fact that "older" women having more kids than younger bears this out as well. The 35+ women are considered "geriatric pregnancies" and come with increased risk to both mother and baby, and the fertility window is closing. These women are old enough to have "been there done that" with corporate life and are more likely to realize their time to start a family is limited.