Interesting discussion! As a Libertarian I typically am against most sorts of government involvement, but my antagonism comes when the government actually sticks their nose in. As of this time, though, the discussion of beacons seems to be mostly amongst industry and advocacy groups. Perhaps governments will require beacons at some point. but more likely it will be the manufacturers who force the issue (i.e. convince us). This concept is pretty close to having radar reflectors on your boat. These are required for some, but not all waters and they significantly reduce your chances of getting run down by a larger vessel.
In any case, what is it that is so onerous to those here who are so opposed? Don't want to be recognised as a cyclist? Well then, throw all your lights away, strip your reflectors, and wear dark clothing at night.