You're right, but depending on who you're talking to, its:

1. A place to communicate freely, regardless of the number of people.

2. They truly believe in its potential, and are being active on it (and some producing content on it) in preparation for those that'll come and be the source of content that they seek (which makes them have the opportunity of a first-mover winner).

And probably some other points.

With that said, people of point 1 and 2 (and other points) will stick with nostr and gather people to it, and will stay because the influencer is here, and a chain reaction will come from it.