I don’t think they will be the services that do it but maybe the next round will. We are basically waiting for boomers to die off and the portion of GenX that never took to understanding technology. After that we have a society that has basically always had the internet and then its just a matter of education.
Also i think the biggest obstacle is the naming and management of instances. Stop giving your instances stupid names. Midwest.social makes sense as its a social network for people who live in the Midwest. Fanaticus.social could be slightly better but still, made for sports fans. Lem.ee and lemmy.world and all those makes all non-tech nerds scratch their head as to which one to go to. Yeah its federated and people can access any instances but they wont get that if they never sign up. Pick a topic and have that be the gateway to other instances.