So, it looks like, "Yes," but with a caveat. For comparison here is the kind of thing IWC have avoided:
Several years ago, Michael Friedberg (official IWC forum moderator) asked the technical director at IWC if the JLC-base in the Mark XII was superior to the ETA base in the Mark XV because the JLC movement had more jewels. He responded,
"...jeweling is not necessarily better --sometime they cracked and the design issues were far more complicated than that. ......metal bearings sometimes (but not always) were sturdier and that it often didn't matter since they would be replaced during routine servicing."
Hmmm, metal bearings make sense (and such bushes are used by some manufacturers) in areas of high torque load and low speed, but with very low torque levels and high rotational speeds (in the parts we're referring to, i.e. counting seconds) we want low friction and hard wearing; the properties provided by ruby.