The % of people I know who found a LTR that translated into a marriage via online dating is still significantly lower than the people I know who met their eventual mate through friends/meetups/work. I'd guess in my social network, it's 20% from dating apps, 80% from IRL. Granted I'm in the 20s/30s bracket, which may still be on the horizon of the societal shift.
Since Jan 2016, I've tested going to meetups on Meetup.com vs using daily usage of dating apps.
Through Meetup.com meetups, I've found occasional dates but also made friends with incredible people, expanded my social network, and continued with self-improvement. To be engaged in ways that challenge me and to occasionally meet and date accomplished women is something to look forward to every single week.
Comparatively, online dating has been hugely disproportionate when calculating time invested vs. time rewarded. I either write messages that get ignored. Or login into the app to indicate interest in matches that eventually don't result in a date. It feels like really boring and demoralizing work.
I'm not saying people can't be successful with online dating. It's just for me, I don't find it particularly gratifying.