Ruby stands or falls with JRuby?

Headius makes an interesting argument

I believe that JRuby is the most crucial technology for Ruby's future right now. Regardless of how fast or how solid the C or C++ based Ruby implementations get, the vast majority of large organizations are *never* going to run them. That's the truth. If we can leverage JRuby to grab 1-2% of the Java market, we'll *double* the size of the Ruby community. If we completely lose the Java platform to alternatives, Rubyists may not have the luxury of remaining Rubyists in the future. It's that big a deal.