They seem to be doing fine:
~10.0M global visible accounts
~2.5M messages per day
~4.5M unbridged accounts
~500K unbridged messages per day
~2.1M rooms that Matrix.org participates in
~20,000 federated servers
~3000 msgs/s out, ~30 msgs/s in on Matrix.org
~400 projects building on Matrix
~70 companies building on Matrix
They're up to 20k visible servers from about 5.5k servers in September 2018, and if you look here: https://youtu.be/1TPICntbC5w?t=1692 you can see the growth curve looks pretty good.
> Also, universal standards are not necessarily a good thing. Decentralization with multiple competing tools and standards is good
Matrix explicitly doesn't try to be "the one true standard". That's the whole idea of their bridging model: https://youtu.be/1TPICntbC5w?t=296