I donk think OF is going to kill "the hobby" (or my in person job, in my case lol). You're going with the premise that it's less work for everyone. Personally, while I do have a OF, it definitely feels like MORE work to me and I 100% prefer escorting. Shooting porn is fun. Taking nudes is fun. But... Editing it is annoying. Having to advertise our OF all the time is tiring (if I wanted this to be my main stream of income I'd have to post my link on multiple platforms multiple times a day, whereas I'm at a place in my escort business where I advertise once a month if at all and still get booked). Having to answer 100 horny messages from the same guy, without a tip, messages that often lead nowhere, is annoying. Feeling pressured to deliver customs in a timely manner is stressful. There are many reasons why OF feels like more work to me and a lot of my friends, and for these reasons, many of us really do prefer in person work.
Do I make money on OF ? Yes. I could make a shit ton if I put more time into it. But it's genuinely not worth the stress. I prefer meeting one on one and keeping OF as my side hustle.
As long as men and women exist, the "hobby" will survive. It isn't going anywhere. We aren't going anywhere.