I think even calling it Lemmy is not the right move. Yeah, Lemmy is the server software running on a bunch of instances. But we also have kbin, and new softwares will pop up and fork and come and go over time. Once we can do some kind of account or community level migration, it won't matter whether you are on Lemmy or kbin or the next great thing. Everything will be federated so it will inter-op beautifully. If an unfriendly instance admin comes along, we can collectively cut and run with minimal interruption.
Thats still a way off from where we are now but the hard step was getting to the Fediverse in the first place. So, welcome to the newcomers among us.
I think the concept of the Fediverse is still really alien to people, even the people who are using it. Everyone is still so used to their centralized platforms, so they still think of the Fediverse in terms of platforms rather than as a whole.
You still hear people say "Mastodon" to mean the microblogging corner of the Fediverse even if they're not actually on Mastodon, and now people say "Lemmy" to mean the link aggregation corner of the Fediverse even if not everyone is actually on Lemmy.
I still use both. 99% of Usenet is spam, but there still a few active groups (especially under comp.*). The BBS scene on the other hand, is booming. I see new users every week on my favourite board.
Sadly most people CAN'T connect through dial-up, even if both parties have all the equipment.
A lot of telcos have redone their entire network in VoIP stuff (with heavy compression) which makes it hard to keep a connection even at 300.
If you're connecting from a modern computer, you just get a telnet client that does the appropriate code pages/ANSI/zmodem/etc.
If you're connecting from a real vintage computer, you get a little dongle that pretends to be a modem (and often accepts AT commands, including fake phone numbers), but secretly connects to WiFi and relays through a telnet connection.
Some BBSes do still have landlines, and there's the occasional ham radio BBS, but 99.999% of it is through IP-based telnet or ssh these days.