The Uru community is not worth cat herding right now, not worth trying to inspire, not worth wrangling.
The *MYST* Community is. The D'niverse community is. The people for whom the D'ni Universe is about more than an online multiplayer experience... THAT is the community that has endured for 15 years, that will continue to endure even if Uru never comes back in any format.
Uru has become, in many people's eyes, the be-all and end-all of the D'ni universe. That without Uru the community collapses, fails, the dream dies. Uru fell, so D'ni falls.
Uru is just one iteration of the story, just one expression of the Mytholody of D'ni. There are a thousand other ways that Mythology could come to light, via Cyan, or other sources.
It doesn't matter if we never get Uru back. It doesn't matter if we never gather in the cavern again. If we're that hot to see each other in the digital flesh, there's a dozen other ways to do so.
What matters is keeping the dream, the stories, the soul of D'ni, alive.