Not stellar? We're having this conversation, aren't we?
The fact that I (nerd that knows all sorts of shit about fedi and is interested in tech topics) am able to use Kbin/fedi to converse with other nerds that know about fedi and are interested in tech does not mean that the fediverse is a storming success.
I can have a conversation with one other person using tin cans and string. This does not mean that tin cans and string are the future of telecommunications.
In reality the people who I have tried to get on here who do not fall in that category were either disinterested from the start, were turned off by the complexity of how it works or stopped coming on it when it turned out there was nothing for them here.