I have been involved UNIX system administration and development for 20+ years. It has never been this lonely in the Solaris community. All of the Open Source packaging projects are effectively dead, due to lack of volunteer. While there used to frequently be Solaris instructions for most Open Source stuff, none of it those docs have been updated in 5-10 years, and nothing new has supported Solaris in a similar time span.
It may just be that Solaris is a wasteland in the space that I care about (web service, primarily). Maybe there are niche markets where Solaris doesn't look like a completely ridiculous choice compared to Linux.