What makes you think it's older users using the mobile app? I think there is a range of users who are using the mobile app. I am an "older" user although my account does not show this but I was trying to use reddit before apps existed when I had an old microsoft touch screen phone back in 07-08. I've almost always used the old.reddit.com page. Only time I use mobile app is when I am not at my desk which isn't too often.

I think what you will actually end up with is a purge of the tablet generation. No more kids pushing content from school. It would only be accessible from desktop...it would be an interesting paradigm in that it doesn't get rid of bots but at least people at workstations are the only ones contributing.