That would be a cool solution too, but Bundler _really_ doesn't like it when you try to load multiple libraries with the same name so I'm not sure if this'll work. I will give it a shot soon, though. :)
* require the broken RSpec
* create a new module called Broken::RSpec
* iterate through each member of the RSpec namespace (methods and variables), and copy it to the new module
* unload RSpec
* require the stable RSpec
When refinements come along in ruby 2.0 this will be easy.
EDIT: Or use ruby_parser to suck the AST out of the very broken rspec source files themselves and instance_eval it inside Broken::RSpec. Danger is my middle name.