Will X still exist in 10 years? At this rate probably not.

But I'm sure there will be enough dedicated people running their own relays that nostr will always survive.Reliable clients could become an issue in the future but the protocol itself, I believe in it and I believe enough other people believe even more strongly than I do.

Like Bitcoin, the infrastructure is in the people's hands, as long as enough individuals take responsibility and run nodes and relays.