Empirically, the Ruby is far from death. There is an active community, more publications than before, and an array of frameworks (Sinatra, Rhodes, RoR) to choose from. Saying Ruby is dying is like looking at a single tree in the forest, noticing it's diseased, and claiming the entire forest will fall to that disease.
Also, it's being forked for individual reasons, like Ruby Enterprise, thanks to sites like github.
There's less people writing ruby code. Both in the interpreter itself, and for open source projects using ruby. You can see on that page a graph showing less people are writing ruby code too.
Also, it's being forked for individual reasons, like Ruby Enterprise, thanks to sites like github.