With the main guy behind the project resigning, OI is essentially dead. It's been dead for some time though and with no commercial backing it never really had much chance. This is sad news indeed (although I haven't really used OI). It marks the end of Open Solaris era.
Can Illumos survive in the long term? Can it become relevant outside of couple of niche use cases?
Ironically, it is Oracle's Solaris which will probably outlive all of them.