Oracle has a profitable business model. It works for them. They have some open source projects that they no longer care to support. In the open source model, someone else is free to carry the torch. It should only require a few people to adopt the Ruby plugin. There are already lots of Netbeans plugins so the learning curve:
A fair point for Rails-on-Netbeans. Not quite so much for Hudson, where Oracle wants not just to stay involved, but to stay in control --- and the amount of control they want is what's pissing off everyone else (including the primary author of the software, Kohsuke Kawaguchi).
So it's actually better for the Ruby/Rails plugin to be dropped by Oracle. Then the community doesn't have to fork to save it from Oracle's controlling hands.
Anyone who cares about open source doesn't buys oracle. So now it doesn't matter. 5 years from now, when "open source believer" rise to a management position, and all the infrastructure and people is oracle, the is really very little decision power.
http://plugins.netbeans.org/PluginPortal
Complaining about Oracle, or any profit driven company, won't help. Growing open source communities will:
http://stackoverflow.com/questions/tagged/netbeans-plugins